I suck at driving... 8km/L that sucks

[Tromatic]

All of you get much better mileage than I do, even when I try to drive like a Prius owner.

[Mikeez]

Someone mentioned that I am studying engineering, he is right. I never said I got my fuel economy off my car. On the car, my average rating is 10 km/L


Using my calculation... I calculated 8 km/L. That is 37.5 L of gas while I traveled 300 KM. That makes it 8 km/L. I know very well that the car displays the L / 100 KM and the smaller number the better. It was a little insulting the someone assumed I was reading off this and made the rest believe.


Testing this:
1. Less idle time
2. Slight quicker acceleration
3. Shifting at 3500-4000 rpm

[carma143]

I don't drive on the highway usually and I get 19 mpg in the USA. I accelerate to the 6k (sometimes 7.4k) mark in 1st gear typically, then shift to 2nd and eventually to 5th. The area I live in is very hilly, and stop signs are every 1/2 mile on average, so it's really fun. I don't mind my mpg, with the 91 octane gas I have.

My parents' Highlander gets 15 when it's supposed to get 20. In my area, mpg, no matter how you drive a car, will only have a max variance of about 10%. I used to floor the Highlander, and the mpg only changed by 0.5 miles/gallon over the course of several tanks.

When I used to shift at ~3k and drive the BRZ as a typical automatic would, I only achieved 20 mpg. Driving 10/10ths, I still achieve 19 mpg; this difference might even be exaggerated because of the winter gas mix.

[gzpermadi]

8 KM/L is normal for short city driving, thats' what I get every day, between 8-9 KM/L.
Even in my previous non-sporty 4 doors car with 2L engine I got the same number.
The number will be closer to 9 if I shift below 2000-2500 RPM as indicated by shifting point at the dash but the car feels so slow with that.
As long as I get 10 days with a full tank I am happy with that.

On the highway cruising with a sixth gear you should be getting 12-14 KM/L.

[themajesticone]

Originally Posted by Mikeez

8 km/L = 19 MPG
12 km/L = 28 MPG


Okay, so I don't know what I am doing wrong... Most FRS Driver get 12 km/L... I get 8 km/L






FIRST TEST:
1st gear shift to second @ 2000 rpm
Other gear shifting to next gear @ 3000-3500 rpm


SECOND TEST:
1st gear to second @ 2000 rpm
Other gear @ 2500 rpm


Am I doing something wrong, every on the car is main component. I am thinking if Toyota or Subaru can reflash the OEM tune.

Perhaps I am wrong, but shifting at a lower RPM does not necessarily translate to better MPG's.

[carma143]

Originally Posted by themajesticone

Perhaps I am wrong, but shifting at a lower RPM does not necessarily translate to better MPG's.

This is what I have found with the BRZ and it's instant mpg mode on the display. Going 35 mi/h in 6th gear will grant my about 60 mpg if I barely let my foot touch the gas pedal on flat terrain. If I press the gas pedal about 3/4ths, I hardly accelerate at all, but my mpg goes down to nearly 7 mpg. The gear and rpms don't dictate how much gas you use at a given time. How far down the gas pedal is dictates fuel consumption.

So, what I have found it that consuming more gas will push the engine into higher rpms, which gives the imitation that rpms are what dictate fuel consumption.

Accelerating at higher rpms provides a quicker acceleration, so the gas pedal is not pushed down for nearly as long.

[Tromatic]

Just filled up. 18.7 MPG on the last tank of Chevron 92 octane. 20% freeway, 20% city, 60% fun roads. The freeway and city driving is mostly to get to the fun roads. AT almost always in manual mode, "pedal dance" on fun roads, if that matters. Imagine how low I could get my MPG with a manual trans.

ETA: Your mileage (generally) is totally dependent on your right foot. If you want to be driven insane and be in genuine fear for your life, go for a ride with a Prius owner who's main goal is the greatest MPG he or she can get. Absolutely unwilling to drive with any sort of urgency when needed. You start to wonder if it will be the oncoming truck or some dude with a gun who will do you in.

Boring, but I've always assumed people knew how this works. Most of them are "No shit, Sherlock?" Top 20 Driving Tips to Improve MPG

Oddly enough, I use some of the techniques listed above, the main one being having a fucking clue and planning ahead. I realize there are perfectly valid reasons (the new me, do you like it?) to be seeking the best MPG, but this is really the wrong car for that.

[Tcoat]

Originally Posted by Tromatic

Just filled up. 18.7 MPG on the last tank of Chevron 92 octane.

Dude, How???????

[synchromesh]

When I first got my car, the government Energy Guide rated the vehicle as ~10km/L. I was getting a little better than that until I lent my car to two people when I was out of town for a couple months. In fact, a long highway trip that inaugural summer was way better than advertised! Last time I checked, the Scion website/Energy Guide advertises ~9km/L. I've been get EPA numbers for a year and a half now.


It is likely winter gas. Another possibility is 2 or 3 weeks ago, my low fuel light went on, I immediately drove maybe half a kilometer to fill-up and the pump said 42.5L after filling up. I could never recall the light going on and being more or less than half a liter from 40L to fill. Strangely enough I couldnt remember when I paid so little for gas.

[steve99]

When my wife drives either car BRZ or Corolla she gets about 20% worse economy than me driving round city.

I can get better economy driving much harder

She generally drives like a nun , but she holds gears too long both our cars are manual 6 speed

When im just crusing i will be in 5th or 6th light throttle where wife will still be in 4th maybe 5th

driving style makes huge difference

check out your Open loop fuel table example below, when your crusing arround you need to be trying to keep in the areas with highest afr. ir low load low rpm light throttle.

http://i.imgur.com/6W3B1GH.png

[bcj]

Cold temperatures and short trips increase gas usage significantly.
If you only go 10 kilos and shut it off for 4 hours of class all the time, the ECU will be using a cold engine map and more fuel.

Best mileage will only happen while the whole system is up to nominal operating temp.

[86SPEED]

Originally Posted by Tromatic

Just filled up. 18.7 MPG on the last tank of Chevron 92 octane. 20% freeway, 20% city, 60% fun roads.

Ouch....... Im on E85 with the supercharger and still get 19 average, 20-21 if i baby it, and 17-18 if i want to go have some fun.. less then 15 if im out driving like i shouldn't be.. But daily commuting is right in the 19's.. on 91 im in the low 22-23's having fun and 27 or so babying it. before any mods i was in the 35's


-Thomas

[wbradley]

For clarification, fuel economy is measured in l/100 km, not km/l.

My twin currently is at 8.7 using Petro Ultra 94 with ethanol. Using OFT tune and definitely not light on the throttle.

My WRX with FA20T is currently averaging 9.7 l/100km. Not bad for 68 more HP/ 105 more ft/lb torque.

[Zozr]

You are so clueless if you thought it was measured in km/L.

That shit is funny