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-   -   Pushing a tank of gas to the limit. (https://www.ft86club.com/forums/showthread.php?t=14684)

RoryTate 08-15-2012 12:48 PM
Pushing a tank of gas to the limit.
 
I've recently had a week long 4200km road trip vacation, with two adults and camping gear.

I pulled a Seinfled-esque below the E due to a lack of gas stations on rural roads. I managed 733km, with "normal" driving up until the last 30 or so km (which turned into a lot of clutch-in coasting down hills).

On straight highway cruising I was getting 725ish km/tank.

How far have you pushed a tank?

[ame="http://www.youtube.com/watch?v=TuEdU_lrtZk"]http://www.youtube.com/watch?v=TuEdU_lrtZk[/ame]

cRazy604 08-15-2012 05:35 PM
733 km in a tank? wow..

CBR600RR 08-15-2012 05:39 PM
That's impressive. With my regular driving, some city, some highway, and just a bit of WOT here and there the most I have managed is 520km and when I filled up I was on the gas light right on the empty line and I only put in 42L. Meaning there was about 8L left in the tank.

engsr 08-15-2012 05:45 PM
Kramer FTW.

rb123 08-15-2012 06:45 PM
curious to know what other drivers are getting out of a tank

scioneric 08-15-2012 07:12 PM
500km all city driving.

b1pkkf26 08-15-2012 07:12 PM
Went to Ottawa last weekend and manage to get 725, brought my average to 6.0, fill up 46.7 litter.

Sh4rp 08-15-2012 09:17 PM
Got close to 800km mostly highway driving, filled up about 45litres, so ten litres left in the tank, i believe its 55 litre tAnk


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mashal 08-15-2012 09:23 PM
It's a 50L tank, I always get about 450km city driving and I fill up with about 38L of gas , so another 12L should get me another 110km .

MY13FRS 08-15-2012 10:37 PM
Normal city driving = approx. 530km (fuel light come on)
Semi-spirited driving = approx 400km (fuel light come on)

Shell V power gas.

synchromesh 08-16-2012 12:54 AM
Took a trip to Seattle and got 650km on the tank with about 100km of that being city driving. Got a speeding ticket on the I-5 while going between 70-80 the whole way there and back.

BLL 08-16-2012 10:45 AM
Aren't you using more fuel when you coast clutched in to keep the engine idling? As opposed to coasting down a hill in gear with your foot off the gas and using 0 fuel?

Khyron686 08-16-2012 10:52 AM
So do most of you assume the light comes on with 10L left? Ie, about 150km left? Seems high.

CBR600RR 08-16-2012 10:58 AM
^ sounds about right.

CBR600RR 08-16-2012 11:01 AM
For an apples to oranges comparison:

My Honda CBR600RR has an 18 litre tank. I get about 220km before the fuel lite comes on. I fill up and put in about 14 litres. about 20% fule capacity left

for the FR-S gas light coming on and filling up with about 40 litres means it also comes on with about 20% fuel capacity left

engsr 08-16-2012 11:20 AM
Quote:
Originally Posted by BLL (Post 383326)
Aren't you using more fuel when you coast clutched in to keep the engine idling? As opposed to coasting down a hill in gear with your foot off the gas and using 0 fuel?
With no load on the motor, the ECU thinks that the engine is just idling and will use fuel. It's best to coast in gear as that keeps the injectors off.

Quote:
Originally Posted by Khyron686 (Post 383342)
So do most of you assume the light comes on with 10L left? Ie, about 150km left? Seems high.
Low fuel light, according to the BRZ manual, comes on with approximately 7L left. Sounds about right since there was one time I filled up just as the light came on and I fill up about ~42L.

I'm averaging about 7.5L/100km so I would imagine that 700km a tank is easy to obtain. I actually switched to 91 Shell and the mileage seems to be better (compared to Ultra 94). Have to see by the end of the week. Oh, and the chirping is gone, too.

synchromesh 08-16-2012 11:27 AM
Quote:
Originally Posted by Khyron686 (Post 383342)
So do most of you assume the light comes on with 10L left? Ie, about 150km left? Seems high.
When I fill up immediately after the light goes on, the gas pump always reads 40L so theres 10L left. Huge contrast to my 91 e30 I had years ago where I learned the hard way that empty really means empty!

FBaxteR-S 08-16-2012 11:28 AM
Quote:
Originally Posted by BLL (Post 383326)
Aren't you using more fuel when you coast clutched in to keep the engine idling? As opposed to coasting down a hill in gear with your foot off the gas and using 0 fuel?
I'm just utterly confused by your statement.

In order for the engine to remain running, it is using gas...

engsr 08-16-2012 11:50 AM
^ As Mythbusters would say - Warning: Science Content. :D

http://www.popularmechanics.com/cars...l-fuel-economy

BLL 08-16-2012 12:44 PM
Quote:
Originally Posted by FBaxteR-S (Post 383434)
I'm just utterly confused by your statement.

In order for the engine to remain running, it is using gas...
Maybe my wording was a little confusing.

When you clutch in and coast, the engine is using fuel to keep it idling.
When you coast in gear, the engine is not using any fuel because the wheels are keeping the engine running.

ymboc 08-16-2012 01:39 PM
Quote:
Originally Posted by FBaxteR-S (Post 383434)
I'm just utterly confused by your statement.

In order for the engine to remain running, it is using gas...
To Clarify Further... modern engines (since ~2000 & earlier in the case of toyota) have the ability to cut the fuel to the engine when coasting in gear. The whole thing is simply termed 'fuel cut' and was introduced to improve gas mileage.

Basically the ecu knows when you've removed your foot from the accelerator, that you're in gear and that the car is traveling at sufficient speed (& engine rpm) that the momentum of the car will keep the engine (& all its accessories) turning over without having to inject fuel to keep combustion going.

If the rpms drop enough (to the point where you'd otherwise stall), or you step on the accelerator or clutch, the engine instantaneously starts injecting fuel again, combustion resumes and everything works as it should.

If you pay close attention to the car you can often 'feel' when the fuel cuts out and when it kicks in again.

FBaxteR-S 08-16-2012 10:07 PM
Wow, thanks a lot for the info guys.

Apparently I haven't been keeping up with the times, lol.

smbrm 08-16-2012 11:27 PM
Best I have measured so far is 5.7L/100km which was 100% highway driving. I am sure that at least 5.6 should be possible, but you have to drive very carefully and ensure no heavy footedness and keep the speed lower: 80-100 kmph.

Khyron686 08-16-2012 11:34 PM
You guys have the wrong car. If I'm under 10L/100 I'm mad. :)

cRazy604 08-16-2012 11:55 PM
Great info I actually thought coasting in neutral was a good idea

dnr 09-05-2012 10:25 AM
any idea on how many liters left when the tank signal turn on ?

Future 09-05-2012 11:02 AM
Quote:
Originally Posted by Khyron686 (Post 384945)
You guys have the wrong car.
qft... AND... I almost always fill up with over a quarter of tank left... Enough fuel in the tank cools down the fuel pump...

thorlius 09-05-2012 11:16 AM
Quote:
Originally Posted by Khyron686 (Post 384945)
You guys have the wrong car. If I'm under 10L/100 I'm mad. :)
I was going to say. The guy with 7.5L/100km? I am averaging 9.1L in my 2010 Cobalt 4AT (2.2L NA base model piece of garbage). The fuelly average is 7.8 for that car and I think a lot of those are with the 260hp TC 2.0L engine. I will be happy if the FR-S is under 10.

stanm 09-05-2012 01:38 PM
I've been averaging 8.x L/km (see my fully signature)
Almost entirely city driving

Ahz 09-05-2012 03:21 PM
Quote:
Originally Posted by dnr (Post 422794)
any idea on how many liters left when the tank signal turn on ?
I ran it down pretty good the other day, the light came on and I kept going and going. After filling out it looks like there is about 10L left when the light comes on. I ran it past the E and it got a bit scary on the highway when I thought I would run out of gas with the needle buried like that, but when I topped up I had about 4.25L left.

About 8L/100km avg, mostly city and some aggressive/spirited.

dnr 09-06-2012 09:53 AM
Quote:
Originally Posted by Ahz (Post 423338)
I ran it down pretty good the other day, the light came on and I kept going and going. After filling out it looks like there is about 10L left when the light comes on. I ran it past the E and it got a bit scary on the highway when I thought I would run out of gas with the needle buried like that, but when I topped up I had about 4.25L left.

About 8L/100km avg, mostly city and some aggressive/spirited.
that was good

I average 8.5 l/100km

Mine went on and drove for another 25-30km and filled up 46.5 L

so 3.5 left? assuming a 50 L tank:happyanim:

finch1750 09-06-2012 10:32 AM
Quote:
Originally Posted by ymboc (Post 383726)
To Clarify Further... modern engines (since ~2000 & earlier in the case of toyota) have the ability to cut the fuel to the engine when coasting in gear. The whole thing is simply termed 'fuel cut' and was introduced to improve gas mileage.

Basically the ecu knows when you've removed your foot from the accelerator, that you're in gear and that the car is traveling at sufficient speed (& engine rpm) that the momentum of the car will keep the engine (& all its accessories) turning over without having to inject fuel to keep combustion going.

If the rpms drop enough (to the point where you'd otherwise stall), or you step on the accelerator or clutch, the engine instantaneously starts injecting fuel again, combustion resumes and everything works as it should.

If you pay close attention to the car you can often 'feel' when the fuel cuts out and when it kicks in again.
I understand coasting in gear gets better mpg and why, but what about distance traveled? When in gear you don't pick up as much speed and don't accelerate as fast I'm assuming because of the add load the engine is under. So if going downhill to flat ground you could travel longer out of gear, yet at worse gas mileage. Which one is better in the long term? Idling doesn't use a ton of fuel.

I personally stayed in gear until I started slowing and then took it out to coast farther fwiw.

jstn 09-06-2012 12:53 PM
Apparently I drive my car really hard. I think I get 300ish miles before the light comes on.

l8apexr 09-08-2012 06:02 PM
sbrm getting 5.7 is amazing!!!!! wow!

ANTiSOViET 09-09-2012 03:12 PM
Just back from travelling, but the best tank I've gotten was 5.7l/100km that happened on a trip into the interior of BC, so some spirited driving, a lot of up and downs etc.

Average tank for me lasts about 625km. My commute is 90% highway.

To the guys that are only getting 10l/100km what the hell are you doing on the road? I get over 10 when I am stuck in stop and go or trying to put in a hot lap. I can't imagine getting that on a regular basis and feeling anything other then anger.

smbrm 09-09-2012 03:51 PM
Quote:
Originally Posted by l8apexr (Post 429472)
sbrm getting 5.7 is amazing!!!!! wow!
I thought so too!:eyebulge:

l8apexr 09-09-2012 10:22 PM
Quote:
Originally Posted by ANTiSOViET (Post 430682)
Just back from travelling, but the best tank I've gotten was 5.7l/100km that happened on a trip into the interior of BC, so some spirited driving, a lot of up and downs etc.

Average tank for me lasts about 625km. My commute is 90% highway.

To the guys that are only getting 10l/100km what the hell are you doing on the road? I get over 10 when I am stuck in stop and go or trying to put in a hot lap. I can't imagine getting that on a regular basis and feeling anything other then anger.
I'm getting close to 10L/100km. But I'm always trying to put in a hot lap!


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