My truck took a dive in gas mileage - The Horse Forum
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post #1 of 12 Old 10-25-2015, 09:42 PM Thread Starter
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My truck took a dive in gas mileage

I just had new tires put on my truck the other day and a front end alignment. The problem is, since I did that my truck is getting lower gas mileage. Probably about 3 miles to the gallon less.
The tires that were on it before were 255/70 17. The new ones that I had put one are 265/70 17. I went with the different size because they are more common I was told. I don't know if that is true or not. Also the previous tire tread were more for highway driving and the new ones have more of all terrain/highway tread (middle of the road). Anyone have a clue if these new tires would make such a difference?
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post #2 of 12 Old 10-26-2015, 09:04 AM
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They may make a small difference, but not that much....have your transmission checked. It may be slipping.
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post #3 of 12 Old 10-26-2015, 09:21 AM Thread Starter
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I'm pretty sure my transmission is fine although changing the fluid is next on the list. I don't feel or hear anything going wrong with that. This change in mileage literally happened from when I dropped the truck off for new tires and alignment to when I picked it up (not even overnight). It's almost making me think that they tinkered around with something. But, not sure if the change in tire size and tread would make that much of a difference.
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post #4 of 12 Old 10-27-2015, 06:33 PM
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Tire size and the tread size can make a big diff. in gas consumption.



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post #5 of 12 Old 10-27-2015, 06:58 PM
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I agree. tire size, type, and inflation level can make a huge difffernence
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post #6 of 12 Old 10-29-2015, 02:20 PM
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Quote:
Originally Posted by tinyliny View Post
I agree. tire size, type, and inflation level can make a huge difffernence
Since the diameter is different it can affect the calculations on the mpgs. If you are looking at the computer it can be much different. Calculate it by hand a few times if you aren't

btw... the tires are 1/2" different in diameter

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post #7 of 12 Old 10-29-2015, 03:37 PM
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My husband's Dodge 2500 Cummins turbo diesel went from 21 MPG with his lower-profile street tires to 14 MPG with his higher profile off-road tires.

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post #8 of 12 Old 10-29-2015, 06:27 PM
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Gas trucks must be more sensitive. We went from a stock wheel to a 19.5 with medium duty truck tires on my f-250 diesel, and it gets the same 17 mpg it has always gotten. Even now, with 350,000+ miles.

When the new torque converter was not locking up properly, however, it went down. When that was replaced, it went back up.

Eta: is this a calculation done by the truck?
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post #9 of 12 Old 10-30-2015, 08:45 PM Thread Starter
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Quote:
Originally Posted by greentree View Post
Gas trucks must be more sensitive. We went from a stock wheel to a 19.5 with medium duty truck tires on my f-250 diesel, and it gets the same 17 mpg it has always gotten. Even now, with 350,000+ miles.

When the new torque converter was not locking up properly, however, it went down. When that was replaced, it went back up.

Eta: is this a calculation done by the truck?
Yes, I'm going by what it says on the computer. I think I'll check it the old fashioned way and see if it tells me different. Could just be the computer with the bigger tires. With the other tires the computer was pretty spot on but maybe it would have to be recalibrated with the different tires.
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post #10 of 12 Old 11-12-2015, 01:41 PM
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try checking the air filter, if its dirty it could lower your fuel economy as much as 20% on some vehicles

Make it idiot proof and someone will make a better idiot.
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