Fuel economy and electronic toy-86-throttle-controller what do you think?

[Aaron.H]

Originally Posted by dssence

Wow Aaron you're situation looks pretty much like mine. So you did your second fill up and had last 1/4 tank left? or I misunderstood? You're having the same numbers I had at first I had around 18litres per 100km and it's pretty much reproducing your same scenario. Keep me more informed , can you detail a little bit more. You're in canada right? and have a Toyota 86 FT manual ?
How are you shifting gears, which gear are you using most of the time, are you keeping the rpm's constant or fluctuating? ( do you use the G-on which shows the gears and tells you the exact moment when to shift) ?

Dssence, that was first fill up since buying the car (dealer had the tank full when i picked it up last friday) and yes i am in Canada and have FR-S MT, now i'm still getting a feel how the cars reacts to different shift points and what not. so far from driving if you are concerned with fuel economy, 2200-2500rpm would be your shift points as well when driving use the insta read l/100km guage don't let it go above 20L/100km in 4th,5th& 6th gear. in 3rd i would say don't let go higher than 25L/100km. 1st & 2nd gear if you can no higher than 35L/100km. that will take a little time to learn as might have to break some old driving habits.(little easy for myself coming from a hyundai elantra where fuel economy was my goal)
also have seemed to notice if your rpm is 1600 or below, you are bogging down your engine & will consume for fuel.

also, do you do lots of heavy city traffic / bumper to bumper / stop and go driving or live in a Hilly area? both of which will impact your fuel economy more than regular city driving or flat driving. like others have mention keep your distance between you and the next car at least 3 car lengths apart, avoid rush hour traffic as much as possible or seek alternative route to destination. for myself i can take either highway or city to work. essentially if i go highway i run more km's(90km round trip) but get better fuel economy and if go city i reduce my km's in half(45km round trip)but fuel economy suffers. but there are other factors still that need to be included, weather, traffic, how much on/off the brakes & gas, coasting to stops etc...


just some of my thoughts & suggestions, hope may help you out

[dssence]

Originally Posted by Aaron.H

Dssence, that was first fill up since buying the car (dealer had the tank full when i picked it up last friday) and yes i am in Canada and have FR-S MT, now i'm still getting a feel how the cars reacts to different shift points and what not. so far from driving if you are concerned with fuel economy, 2200-2500rpm would be your shift points as well when driving use the insta read l/100km guage don't let it go above 20L/100km in 4th,5th& 6th gear. in 3rd i would say don't let go higher than 25L/100km. 1st & 2nd gear if you can no higher than 35L/100km. that will take a little time to learn as might have to break some old driving habits.(little easy for myself coming from a hyundai elantra where fuel economy was my goal)
also have seemed to notice if your rpm is 1600 or below, you are bogging down your engine & will consume for fuel.

also, do you do lots of heavy city traffic / bumper to bumper / stop and go driving or live in a Hilly area? both of which will impact your fuel economy more than regular city driving or flat driving. like others have mention keep your distance between you and the next car at least 3 car lengths apart, avoid rush hour traffic as much as possible or seek alternative route to destination. for myself i can take either highway or city to work. essentially if i go highway i run more km's(90km round trip) but get better fuel economy and if go city i reduce my km's in half(45km round trip)but fuel economy suffers. but there are other factors still that need to be included, weather, traffic, how much on/off the brakes & gas, coasting to stops etc...


just some of my thoughts & suggestions, hope may help you out

Hi Aaron thanks so much for your answer. Listen it would be kind of hard for me to keep the insta fuel read on a certain level cause that would fluctuate acording to rpms.
I would say if you can guide me a bit.. what would be the rpm's to keep? if I should go over 2500 or below a certain rpm range?
Which gear should be the shortest to avoid consumption.. What I could experiment is that going in 4th gear shows me on real time 9.4 litres, but this car should be doing less. Again I know all this about the rush and stop would make consume more fuel.
And I hear being in neutral idling makes the car increase fuel consumption incredibly more.
Anyways how long you got your car now? and what's the average fuel showing up? (what fuel are you filling your tank with RON index or fuel station )

[Aaron.H]

Originally Posted by dssence

Hi Aaron thanks so much for your answer. Listen it would be kind of hard for me to keep the insta fuel read on a certain level cause that would fluctuate acording to rpms.
I would say if you can guide me a bit.. what would be the rpm's to keep? if I should go over 2500 or below a certain rpm range?
Which gear should be the shortest to avoid consumption.. What I could experiment is that going in 4th gear shows me on real time 9.4 litres, but this car should be doing less. Again I know all this about the rush and stop would make consume more fuel.
And I hear being in neutral idling makes the car increase fuel consumption incredibly more.
Anyways how long you got your car now? and what's the average fuel showing up? (what fuel are you filling your tank with RON index or fuel station )

yes that it is a little difficult to keep a read on the insta fuel read but by doing this kind of technique it will teach you better how to control the gas pedal.you will find over time you aren't as heavy on the pedal. also could trying imaging that there is an egg under the gas pedal and you don't want to break it.

imo rpm's to keep while driving is 1700-1900. after going over 70km/hr
if recall will be over that rpm but than you are doing highway driving and your insta read gauge shouldn't fluctuate as much. 1st & 2nd gear will consume the most fuel fyi

so far me in the city here. doing 55km/hr in 5th gear,my insta read gauge will go from 5.0l/100km up to 8l/100km..... if can keep a steady speed, than stays around 6ish marker, i even use cruise control if the conditions allow for it

in regards to fuel,i just used local CO-OP gas bar using their 91 premium octane fuel for the first fill up. been using them for years as it is a local membership and get yearly rebate pending how much gas you buy.i may switch over to Shell premium 91 octane b/c of the no ethanol business

[dssence]

Originally Posted by Aaron.H

yes that it is a little difficult to keep a read on the insta fuel read but by doing this kind of technique it will teach you better how to control the gas pedal.you will find over time you aren't as heavy on the pedal. also could trying imaging that there is an egg under the gas pedal and you don't want to break it.

imo rpm's to keep while driving is 1700-1900. after going over 70km/hr
if recall will be over that rpm but than you are doing highway driving and your insta read gauge shouldn't fluctuate as much. 1st & 2nd gear will consume the most fuel fyi

so far me in the city here. doing 55km/hr in 5th gear,my insta read gauge will go from 5.0l/100km up to 8l/100km..... if can keep a steady speed, than stays around 6ish marker, i even use cruise control if the conditions allow for it

in regards to fuel,i just used local CO-OP gas bar using their 91 premium octane fuel for the first fill up. been using them for years as it is a local membership and get yearly rebate pending how much gas you buy.i may switch over to Shell premium 91 octane b/c of the no ethanol business

Again kind of confusing to me. You're saying rpms while driving should be 1700-1900 so fuel consumption does not increase.
So you're shifting 1st and 2nd gear but you press slowly the gas pedal? cause when even If I press slowly the gas pedal I get on the inst fuel 26litres/100km that's way to much I couldn't find a way to get a 5.0l mark on 1st or 2nd gear.. rather moving the car like a turtle.
You're getting a 5.0l/100km to 8km/100km on 5th gear? .. kay. .but then on other gears 1st, 2nd and 3rd what insta fuel read you got at how many rpms?
91 octane fuel in australia is equal to ron index 98 ?
I think the best insta fuel reading I could get was in 4th , 5th gear and would give me 9.0l/100km

[Tromatic]

You bought the wrong car if you are going to do nothing but sweat gas mileage. If by "insta fuel" you mean the readout showing your current mpg, that thing is doing nothing more than making a semi-educated geuss based on data from the engine.

Stop doing that, it's what Prius drivers do. Did/have you done any sort of break-in, if only the method recommended in the manual? Opinions vary, but creeping around trying to keep that "insta" number high is not going to do anything for you at all.

I'm thrilled when my calculations at the pump show over 23 mpg.

[dssence]

Originally Posted by Tromatic

You bought the wrong car if you are going to do nothing but sweat gas mileage. If by "insta fuel" you mean the readout showing your current mpg, that thing is doing nothing more than making a semi-educated geuss based on data from the engine.

Stop doing that, it's what Prius drivers do. Did/have you done any sort of break-in, if only the method recommended in the manual? Opinions vary, but creeping around trying to keep that "insta" number high is not going to do anything for you at all.

I'm thrilled when my calculations at the pump show over 23 mpg.

hey cool you came in, i'm not looking over at the insta fuel at each gear. My problem arised when I picked up my car at my dealer (full tank). Then to my surprise I got the last 1/4 tank left, and guess what? have done only 135km with just 32 Litres of fuel. I guess that would be a good reason why I'm kind of paranoid.
So now I came to my 2nd fill on my tank filled with shells vpower average is giving me 12l/100km, better than my previous one which showed an average of 18l/100km. that's why i'm trying to solve what's going on here.
I'm trying to do short shifts on 1st, and 2nd gear , go on 3rd. and keep my rpms below 3k . But the only time I do see insta fuel around the 9l/100km range is when I'm on 4th gear and at stable rpm's. It's not I'm being paranoid seeing the instant fuel consumption on each gear. It's the whole stituation.I want to at least get 400km with a full tank on city driving.

[Tromatic]

You are not doing your car any favors. Forget the fuel consumption numbers until after you get past the break-in mileage. Driving around lugging the engine is one of the worst things you can do to a new car. Not only is that not the greatest thing for the mechanical parts that benefit from it, your ECU is also trying to run things optimally with you doing everything to keep it from doing so.

Again, forget the friggin' mileage, follow the manual regarding break-in then worry. After all, it's got a warranty, correct?

[dssence]

Originally Posted by Tromatic

You are not doing your car any favors. Forget the fuel consumption numbers until after you get past the break-in mileage. Driving around lugging the engine is one of the worst things you can do to a new car. Not only is that not the greatest thing for the mechanical parts that benefit from it, your ECU is also trying to run things optimally with you doing everything to keep it from doing so.

Again, forget the friggin' mileage, follow the manual regarding break-in then worry. After all, it's got a warranty, correct?

kay , so what do you suggest, AFAIK new cars don't have that break in period like old cars had. Where did you read there's a break in in the manual? maybe i've skipped it
.

[Aaron.H]

Originally Posted by dssence

Again kind of confusing to me. You're saying rpms while driving should be 1700-1900 so fuel consumption does not increase.
So you're shifting 1st and 2nd gear but you press slowly the gas pedal? cause when even If I press slowly the gas pedal I get on the inst fuel 26litres/100km that's way to much I couldn't find a way to get a 5.0l mark on 1st or 2nd gear.. rather moving the car like a turtle.
You're getting a 5.0l/100km to 8km/100km on 5th gear? .. kay. .but then on other gears 1st, 2nd and 3rd what insta fuel read you got at how many rpms?
91 octane fuel in australia is equal to ron index 98 ?
I think the best insta fuel reading I could get was in 4th , 5th gear and would give me 9.0l/100km

yes pressing the gas pedal slowly. . nonetheless fuel economy will improve over time and is and always will be a controversial subject on any car just like how to break-in any car.

for myself right now, keeping the rpms low is ideal, as i'm driving on snow, & ice and trying to reduce amount the wheels from spin. to maintain maximum traction but still gotta have fun and put it sideways here and there.car is a blast in the snow


end of it all though continue to record your mileage after fill-ups & just drive the car like you normally would in any car. Like Tromatic said, don't worry about the fuel economy numbers until after break-in period is over.

[humfrz]

Originally Posted by dssence

kay , so what do you suggest, AFAIK new cars don't have that break in period like old cars had. Where did you read there's a break in in the manual? maybe i've skipped it
.

Well, the manual for my FR-S addresses a break in period and proceedure .... not sure about yours .....


humfrz

[Tromatic]

Paper manual in the car, this is from the BRZ PDF:

2-1
■New vehicle break-in driving (the first 1000 miles [1600 km])
The performance and long life of your vehicle are dependent on how you
handle and care for your vehicle while it is new. Follow these instructions
during the first 1000 miles (1600 km):
●Do not allow the engine speed to exceed 4000 rpm except in an emer-
gency.
●Do not drive at one constant engine or vehicle speed for a long time,
either fast or slow.
●Avoid starting suddenly and rapid acceleration, except in an emergency.
●Avoid hard braking, except in an emergency.
The same break-in procedures should be applied to an overhauled engine,
newly mounted engine or when brake pads or brake linings are replaced
with new ones.

Note that should also include some full-throttle runs to approx 4k, typically from 3rd on up. Full-throttle does not mean red-line it off the lot like that other yobbo thinks. Also, engine braking helps as well. I follow a fairly typical motorcycle break-in, always worked well for me. Keeping it below 4k also does not mean creep around in 6th gear, either.

I really don't know why they bother to kill trees to publish a manual.

[humfrz]

Originally Posted by Tromatic

Paper manual in the car, this is from the BRZ PDF:


I really don't know why they bother to kill trees to publish a manual.

Maybe they would be read more widely, if the cover of the manuals was leather and embossed with TRD and had LEDs around the edges .....


humfrz

[dssence]

Originally Posted by Tromatic

Paper manual in the car, this is from the BRZ PDF:

2-1
■New vehicle break-in driving (the first 1000 miles [1600 km])
The performance and long life of your vehicle are dependent on how you
handle and care for your vehicle while it is new. Follow these instructions
during the first 1000 miles (1600 km):
●Do not allow the engine speed to exceed 4000 rpm except in an emer-
gency.
●Do not drive at one constant engine or vehicle speed for a long time,
either fast or slow.
●Avoid starting suddenly and rapid acceleration, except in an emergency.
●Avoid hard braking, except in an emergency.
The same break-in procedures should be applied to an overhauled engine,
newly mounted engine or when brake pads or brake linings are replaced
with new ones.

Note that should also include some full-throttle runs to approx 4k, typically from 3rd on up. Full-throttle does not mean red-line it off the lot like that other yobbo thinks. Also, engine braking helps as well. I follow a fairly typical motorcycle break-in, always worked well for me. Keeping it below 4k also does not mean creep around in 6th gear, either.

I really don't know why they bother to kill trees to publish a manual.

Kay so basically the idea is to move the rpms from 2k to 4k but never keep them stable during the break in right?
To add matters worse , I don't use that much the car on highway or commute basically within the city so it'll be a long time till I reach to 1600 km , So i guess the break in period will last a long time. I think i'm screwed.

[humfrz]

Originally Posted by dssence

..............I don't use that much the car on highway or commute basically within the city so it'll be a long time till I reach to 1600 km , So i guess the break in period will last a long time. I think i'm screwed.

A good time for a ...... road trip ..... ramble along the coast for a few days ....


humfrz