What MPG's are you getting with... 37's - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 25 (permalink) Old 08-12-2010, 01:18 AM Thread Starter
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Exclamation What MPG's are you getting with... 37's

I know there's a problem with my truck/tuner.

I have an F250 ridding on 37s with 3.73 r&p's.

What is the factory (lie-o-meter) MPG reading stating for any of you running this combo and the Spartan 210 and 250 tunes?

Any help would be appreciated.

Thanks,

Josh
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post #2 of 25 (permalink) Old 08-12-2010, 01:31 AM
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I am not sure going by the "lie o meter" and comparing with other trucks is going to give you any accurate readings to go off of becuase they can vary by so much from truck to truck and actual mileage to what the truck tells you. You need to have hand calculated mpg's.
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post #3 of 25 (permalink) Old 08-12-2010, 01:41 AM Thread Starter
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though I appreciate your response I still would like to see what other trucks are reading. Mine is drastically different from what it used to be, equal in less power and actual mileage per tank.
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post #4 of 25 (permalink) Old 08-12-2010, 03:43 PM
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Well what is it reading? What size was your stock tires?

2010 F250 Lariat FX4 w/Sync.. Everything but nav and sunroof.. Little bit of IDP to help it out
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post #5 of 25 (permalink) Old 08-12-2010, 04:58 PM Thread Starter
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It was reading around 18 to 19 constant on the hwy with the old 210 tune on 95% 37in tires.

On the 250 tune and 20% 37in tires it will give me 16 if I baby the truck.

I seem to only be getting about 400 miles to a 30gal tank where as before it was much better.
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post #6 of 25 (permalink) Old 08-12-2010, 09:16 PM
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Quote:
Originally Posted by TriggerTX View Post
It was reading around 18 to 19 constant on the hwy with the old 210 tune on 95% 37in tires.

On the 250 tune and 20% 37in tires it will give me 16 if I baby the truck.

I seem to only be getting about 400 miles to a 30gal tank where as before it was much better.
My question for you is this.....are your tunes corrected for the tire size?

Also, if you went to a 37" tire and it was reading 18 to 19 mpg at 95% tread then the truck was probably not use to the new, bigger tires. Now that you have 20% tread left, you obviously have had the tires awhile, and now the computer in your truck has adjusted to the bigger tires. My guess is that you went from a 33-34" stock tire to a 37" tire.....which is a much bigger jump than you think.

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post #7 of 25 (permalink) Old 08-13-2010, 05:48 AM Thread Starter
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Stroker, your just not making any sense......

Its a conspiracy between my truck, tires, and tunes. I get it. Mutiny!

I had the tires a good while before any tuning.

I know what 37 minus 34 relates to in dog years.

And that last line made no sense.

But I know that I can and should be getting far more out of a tank of fuel.
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post #8 of 25 (permalink) Old 08-13-2010, 04:55 PM
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Actually my post makes perfect sense. You didn't answer my question. Are your tunes corrected for the difference in tire size? You can't go from a stock tire to a 37" tire and expect your spedometer and odometer to be accurate. It throws everything off and makes your fuel mileage calculations pointless.

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post #9 of 25 (permalink) Old 08-13-2010, 10:01 PM
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Quote:
Originally Posted by TriggerTX View Post
Stroker, your just not making any sense......

Its a conspiracy between my truck, tires, and tunes. I get it. Mutiny!

I had the tires a good while before any tuning.

I know what 37 minus 34 relates to in dog years.

And that last line made no sense.

But I know that I can and should be getting far more out of a tank of fuel.
did you reset the mpg after you put the new tires on. If not then the reason it's gone down is because it has averaged all your crappy mileage with the 37s in with the good mileage you had with the smaller tires.

I have 37s and running the 275 it'll stay around 15.5-16 on the liometer.

I'm pretty sure you just didn't reset the counter. with the 210 yoru liometer will probably be reading around 12 or 13 and with the 250 i would say 14 or 15

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post #10 of 25 (permalink) Old 08-14-2010, 05:16 AM
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Quote:
Originally Posted by O2ShootTheJ View Post
did you reset the mpg after you put the new tires on. If not then the reason it's gone down is because it has averaged all your crappy mileage with the 37s in with the good mileage you had with the smaller tires.

I have 37s and running the 275 it'll stay around 15.5-16 on the liometer.

If your speedo isnt corrected that should equal 16.8175-17.36 with the 37" tires..

I'm pretty sure you just didn't reset the counter. with the 210 yoru liometer will probably be reading around 12 or 13 and with the 250 i would say 14 or 15
Maybe this helps

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