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 Gas mileage and KM2s....and without!!

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bigdogdewey2
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PostSubject: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeTue Feb 05, 2013 11:19 pm

ok so this past week i starteda new job that requires me to drive 70 miles a day...thats alot and i did the first week with the KM2s...i filled up on the previous Sunday...filled up on that Wednesday and then filled up this past weekend...in all i spent $110 to drive the 350 miles for that week...this past weekend i did fill up but i also changed my tires back to the stock 265s and WOW what a difference...i know its only tuesday but i have just used a bit over a quarter tank so far!!! i am basically going to double my gas mileage by just changing my tires!!!
Now there is no way that i am gonna keep these on for off road activities..i WILL be putting the KM2s back on for any and all off road fun...but for the time being i will be using my little stockers and look like a pregnant rollerskate...
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ULTIMATEcruiser
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeTue Feb 05, 2013 11:58 pm

Now think what you could get if you take the lift off hahaha!!!

I noticed my first decline in fuel mileage right after installing my lift. Back then I was still riding on the stock 265's as well. Then, when I went up to 285's and 17 inch wheels it dropped a couple more miles per gallon. Unfortunately, I don't see it getting any better any time soon and I get in the 14-15 mpg range now.

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Gas mileage and KM2s....and without!! 2567de78-1fb0-4258-89df-6765211f99b8_zpsff4f1c15

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Crazy Hube
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 12:01 am

I don't really think adding a lift with stock tires will change your MPG's enough to notice.

Sure the more exaggerated drivetrain angles might cause more drag, but hardly any.

But that is the only difference
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ULTIMATEcruiser
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 12:06 am

Crazy Hube wrote:
I don't really think adding a lift with stock tires will change your MPG's enough to notice.

Sure the more exaggerated drivetrain angles might cause more drag, but hardly any.

But that is the only difference

Yeah well it did on mine. Went from getting 20 on the highway down to 16 after the lift now it varies. The best I have seen with my current setup is 18 and that was driving to the OBX and all around the OBX over a year ago. Even with the addition of the Demello bumper it has not altered my mpg's like I thought it might.

BTW, not complaining here just stating facts. If I truly didn't like the fuel mileage I was getting I would never have bought my FJ nor would I have modded it. Also, it makes it much easier to put gas in it since it's paid for.....ha I love saying that!!

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Crazy Hube
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 12:12 am

So why do you think the MPG's changed with the lift and stock tires?

I can't think of anything that would cause the MPG's to change
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ULTIMATEcruiser
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 12:32 am

By installing a lift it alters the geometry of the vehicle and thus creates more drag on the vehicle by allowing more air to pass under it, around the tires, and around the frame and underbody. I can only assume that when Toyota designed the FJ cruiser they most likely worked with variables in ride height and engine tuning to create the best fuel mileage they could in this type of vehicle.

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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 12:36 am

Yea I reckon. I just figure it won't displace any more air, the surface area does't change.

Not like it is aerodynamic to being with. But I see what you are saying
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MadToy
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 11:43 am

Mike - you're running those KM's on steel wheels too, aren't you? Ever weigh the combo? I'll bet they're nearly double the weight of the 265's with stock wheels. Your truck thinks it just lost 800 lbs.....
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FJ Derek
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 5:43 pm

I noticed my biggest mpg drop in adding the 5100's and raising my front end.
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bigdogdewey2
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 9:50 pm

Jami and Derek...i can definetaly see the ride height being a factor in MPGs...the more of the truck you put in the wind the worse the mileage...i dont actually remember having a drop in MPGs when i added the lift...but at the same time i honestly didnt even think to figure it in...and the tire wheel combo that i have (KM2 with steel wheels) Nick is HEAVY...i havent weighed them as i really dont want to hold the sucker up and step on a scale...too heavy but i bet the difference is probably 45-50 lbs a piece so that would make close to 250 with all 5 off...not to mention the wind resistance and the compound of the rubber...either way last week i filled up from the gas light on wednesday...today i am just barely under a half a tank...its awesome...its like i found 50+ bucks today!!!
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iwashmycar
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 10:32 pm

Heck a set of 10 ply E rated tires can set you back a few MPGs (stock size)... that could be like 40-50 miles / tank!

I could imagine steelies and larger KM2s killing it!!
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bigdogdewey2
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 10:50 pm

killin it isnt even the word....my MPGs were down to probably 11-13 ...seriously...yeah in fact if i drove around town i would get better mileage than if i was on the highway...first i had heard of better mileage in the city than highway....
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MadToy
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 10:57 pm

200 lbs of rotating mass would be roughly the equivalent of 400 lbs in the truck. So it's as if you dropped off two fat friends.....

Smile
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bigdogdewey2
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeWed Feb 06, 2013 11:58 pm

or if i dropped myself off twice!!
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Crazy Hube
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeThu Feb 07, 2013 12:17 am

Very funny Michael
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitimeThu Feb 07, 2013 12:44 am

Leveling my front end did nothing to the mileage. I'm hoping adding 285s does very little. Hopeful thinking.
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PostSubject: Re: Gas mileage and KM2s....and without!!   Gas mileage and KM2s....and without!! Icon_minitime

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