How to increase MPG and some interesting data - Toyota FJ Cruiser Forum
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#1 (permalink) Old 05-10-2011, 09:26 PM
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How to increase MPG and some interesting data

To anyone who is interested in the FJ cruiser's engine performance and how I was able through testing to improve gas mileage....

I purchased one of those Scangauge's that monitor mpg,horsepower,temperatures, etc... because I felt that I had horrible gas mileage I estimated to be around 14-15mpg.

After driving to work and back without changing my driving style I was averaging 14-16mpg. Being able to see the mpg change in realtime on the gauge I was able to adjust my driving to increase mpg and I was amazed at the differences acheived.

I have compiled a list of data that some may find interesting:

2007 FJ Cruiser 4x2 32" all-terrain tires w/3in lift, AT ****All data is taken from a flat surface @ 87-92F Intake air temp in high humidity(not sure of exact figure)... Shreveport, LA*****

0-25mph------14-21hp @ 0-6mpg!!!!!!!
25mph non-cruise --------17-19hp @ 28-35mpg
25mph cruise-------17-19hp @ 30- 35mpg
60mph non-cruise------ 40-52hp@ 28-33mpg
60mph cruise --------35-50hp@ 28-35mpg
70mph cruise --------47-74hp @ 21-26mpg
70mph non-cruise----47-74hp @ 19-25mpg @ 3.45GPH!!!!!

By using cruise every chance I get I was able on one 20 mile trip home from work by way of downtown interstate driving to highway and then through suburban stop and go traffic I acheived a 24.1mpg avg

Additional information that some may find amusing....

AT ENGINE IDLE: .33gph @ 5.5hp with a/c compressor on .45gph @ 7.5hp

On regular unleaded gas I acheived 243hp by flooring it from 0 mph at a stop sign.

Without cruise engaged.... coasting down hills and slight slopes on the interstate registered 60-90mpg @ 10-14hp.

And as figured disengaging the engine from the transmission produces 60-90mpg at speeds above 20mph.

Next I'm going to see how much of a difference it makes while drafting behind an 18 wheeler

Anyways... hope this was helpful to someone.

Last edited by Ryan4544; 05-11-2011 at 05:50 PM.
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#2 (permalink) Old 05-10-2011, 09:40 PM
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Re: How to increase MPG and some interesting data

I need to get one of those installed. I regularly avg 17-18, but it could always be better.

Thanks for the detailed write up

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#3 (permalink) Old 05-10-2011, 09:46 PM
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Re: How to increase MPG and some interesting data

Yes It's a great tool. After a few fill ups with improved gas mileage it will pay for itself.
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#4 (permalink) Old 05-10-2011, 09:54 PM
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Re: How to increase MPG and some interesting data

great info Ryan, SG2 is fantastic, probably paid for itself on my truck already. It really really taught me how to drive FJ and get the best out of it. I assume your data is for AT? Not 6MT.

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#5 (permalink) Old 05-10-2011, 10:52 PM
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Re: How to increase MPG and some interesting data

I use the heck out of my SGII also. def payed for itself in saved gas through altered driving habits.

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#6 (permalink) Old 05-11-2011, 12:13 AM
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Re: How to increase MPG and some interesting data

Yes it's an AT.
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#7 (permalink) Old 05-11-2011, 12:54 AM
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Re: How to increase MPG and some interesting data

I wouldn't trust the scangauges accuracy of MPG very well. I just use it as a ball park figure and use the pump and miles driven technique.

For instance, have you verified that your speed is exactly correct on the scangauge using a GPS? Every single FJ from the factory with factory sized tires shows it is going faster than it actually is. At 70 with factory tires, you are actually going about 68-69. With 285s, your speedometer is more accurate than with factory tires.

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I use the heck out of my SGII also. def payed for itself in saved gas through altered driving habits.
This is the best way to use it to save gas. Monitoring your driving habits in real time will let you adjust accordingly.

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#8 (permalink) Old 05-11-2011, 05:00 AM
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Re: How to increase MPG and some interesting data

Quote:
Layonnn previously said: View Post
I wouldn't trust the scangauges accuracy of MPG very well. I just use it as a ball park figure and use the pump and miles driven technique.
+1

Those devices just use engine vacuum to estimate instantaneous mpg and are not accurate for actual mpg. No doubt that they can teach you to have better driving habits, but the mpg from them is all relative, not absolute at all.

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#9 (permalink) Old 05-11-2011, 05:06 AM
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Re: How to increase MPG and some interesting data

To gain the most MPG you need to keep engine load down to a minimum, ie low revs. Other thing of course are tires, aerodynamics, weight, etc but those really aren't in favor of the fj so it really comes down how you drive it and maintain it. Wanna see the most mpg, drive like grandma.
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#10 (permalink) Old 05-11-2011, 07:02 AM
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Re: How to increase MPG and some interesting data

Quote:
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To gain the most MPG you need to keep engine load down to a minimum, ie low revs.
That might work for AT, amazingly 6MT likes RPM, if you keep it down to minimum it eats gas like there is no tomorrow. SG2 told me that

As said above, tracking MPG with SG2 is nowhere near as accurate as "ball park figure and use the pump and miles driven technique" but it sure helps to figure out optimal driving style.

2010 FJC AG 6MT
2005 4Runner SE

My build..slow but consistent

http://www.fjcruiserforums.com/forum...6mt-build.html

www.fjnortheasters.org

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