Anybody working to improve fuel mileage? - Page 7 - Toyota FJ Cruiser Forum
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post #61 of 83 (permalink) Old 06-25-2019, 04:07 PM
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Re: Anybody working to improve fuel mileage?

Anyone with a larger wheel/tire package get any improvement in MPG by regearing?

I imagine it might help a little depending on what you are running, and the kind of driving you do.
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post #62 of 83 (permalink) Old 06-27-2019, 04:04 PM
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Re: Anybody working to improve fuel mileage?

2012 FJ, stock and I regularly am getting 20 - 22 MPG. Am I doing something wrong????
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post #63 of 83 (permalink) Old 06-27-2019, 04:40 PM
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Re: Anybody working to improve fuel mileage?

Driving like an old man or bad math?

After Monday and Tuesday even the calender says WTF


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post #64 of 83 (permalink) Old 06-28-2019, 10:37 AM
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Re: Anybody working to improve fuel mileage?

One cannot improve fuel economy much unless one can improve the size and shape of the body. By order of impact on fuel economy:

1. Smaller cross sectional area - less drag (smaller vehicle that is lower to the ground)
2. Better coefficient of drag (different body shape)
3. Reduce the mass of the vehicle
4. Convert to a full electric drivetrain

Unless you can shape-shift an FJ or have unlimited money you are basically stuck with the stock fuel economy.

Small improvements:
* Drive slower
* Install smaller tires or tires with lower rolling resistance; keep tires aired up
* Keep a clean air filter
* Install an aftermarket EMS with better sensors and tune everything more precisely; this would have the largest impact of all -- but it is too tempting to tune for more power instead of efficiency

Physics: it's the law.
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post #65 of 83 (permalink) Old 06-28-2019, 12:43 PM
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Re: Anybody working to improve fuel mileage?

FJ Cruiser and fuel mileage?



Ahh, that's a good one!


But in all seriousness, I'm not surprised you can get 20.1 in stock fashion. It's a bit lighter and lower than my 5th gen 4Runner, and that normally gets between 19 & 20, up to 21.5 if I keep it under 60 (construction zones! I don't do that on purpose). I just came back from WI last weekend and averaged 18.6 for the trip there and back but was loaded with people, fridge/freezer, duffel bags, and such running A/C most of the time.

My advice would be to drive it like there's an egg between your shoe and the throttle, you may pick up a bit there. The more air (or cold air) you can move through the engine at cruising RPMs can help as well. This usually means giving up good filtration though. I used to play this game with my 3rd gen Tacoma, and even driving like I was on my way to early Pinochle, and still never achieved even close to what Toyota claimed they get. High altitude and a non torquey 3.5L engine was the culprit for me.
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post #66 of 83 (permalink) Old 06-28-2019, 01:47 PM
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Re: Anybody working to improve fuel mileage?

Quote:
mikey previously said: View Post
Driving like an old man or bad math?
I am okay with that, I AM an "old man".
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post #67 of 83 (permalink) Old 06-28-2019, 03:01 PM
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Re: Anybody working to improve fuel mileage?

Quote:
dru2 previously said: View Post
(snip)

Install an aftermarket EMS with better sensors and tune everything more precisely; this would have the largest impact of all -- but it is too tempting to tune for more power instead of efficiency. Physics: it's the law.
I 100% agree with all but your last point. Unless the aftermarket EMS can command a range of valve timing to approach that of a true Atkinson-cycle engine. and the Toyota VVTi cam-timing hardware has enough range of adjustment to follow the EMS commands, I don't think that very slightly improving mixture control via better sensors & control algorithms would "have the largest impact of all".

Aero drag, weight, and driving habits are by far the biggest factors, unless I am missing something that a more sophisticated EMS might provide.
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post #68 of 83 (permalink) Old 07-10-2019, 08:33 PM
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Yes it really is just physics, as someone said in this thread. But it’s the physics of the engine breathing in and out that are important. First and easiest, ditch the stock air filter and get a K&N or green filter. Next, find that “scrubber” filter that sits behind the air filter and get your dremmel and pull it out. If you have over 100k miles, it will be pitch black and you can’t see through it. Your engine will then breath a hugh sigh of relief. Next, go get some NGK Iridium spark plugs and replace the stock junk. Next, work on the exhaust end with a less restrictive muffler/exhaust system. This will get you about 20 MPG doing 70 MPH down the freeway.
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post #69 of 83 (permalink) Old 07-10-2019, 09:45 PM
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Re: Anybody working to improve fuel mileage?

My 08 gets 15-16 avg in the city mixed highway . when i go up north I get 12-14 mpg. i go from 1800ish to 7000-9000 ft. now coming home it will get 17-18 all down hill with my RTT on. I have a air box and cat back exhaust. i also have a light tire and wheel package 73 lbs. my wheels only weigh 18 lbs each and the tires are 55 lbs. . if I get a heavy foot it looses 1-1 1/2 mpg. when the tent is off pick up about 1 mpg. the best it ever did was 22 mpg that was no roof rack and 265 75r-16 tires.
I see 6-8 mpg when climbing with the RTT on my scan gauge. when I wheel it it has been 10-11 mpg. I am surprised that it gets what it does. it basically has the aerodynamics of a brick.
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post #70 of 83 (permalink) Old 07-16-2019, 05:23 PM
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Re: Anybody working to improve fuel mileage?

I tried Airaid and volant air intakes and it better with fuel economy
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