Tire size VS/ MPG
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Joined: Sep 2003
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From: Hampstead, NC
Tire size VS/ MPG
We talked about this a little in another thread, thought I would test the waters. I have a '00 F250 4x4 long bed super crew. I changed from the factory tires to a 305/70r16. I know this changes my final gear ratio, but the truck looks sooooo much better with this size tire than with stock--------------
Problem is, MILAGE SUCKS!!!!!! I instantly went from getting 300 miles per half a tank to getting 190 to 200 miles. (18 ~18.5 to 12 ~ 13)
Question is this: Other than the obvious (back to stock tires or change gear ratio front and rear) are there any tricks?
I am running the new programmer ( 3 settings) and a flat K&N (I know, it will be changed shortly-used 'em in gas motors for years, have been picked on enough now!)
Problem is, MILAGE SUCKS!!!!!! I instantly went from getting 300 miles per half a tank to getting 190 to 200 miles. (18 ~18.5 to 12 ~ 13)
Question is this: Other than the obvious (back to stock tires or change gear ratio front and rear) are there any tricks?
I am running the new programmer ( 3 settings) and a flat K&N (I know, it will be changed shortly-used 'em in gas motors for years, have been picked on enough now!)
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Joined: Feb 2002
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From: Bonney Lake, WA
One thing you might have thought of, but didn't mention, is that your speedometer/odometer might be off quite a bit as a result of the change. When I bought my truck, the previous owner had just installed 35" tires, but hadn't done anything about recalibrating the speedo. After a short time, I realized that I was actually travelling quite a bit faster than the speedo indicated, so I recalibrated it. Without changing anything else at the time, my mileage went up about 8%. Of course, my mileage didn't actually change, but my ability to measure it did.
Unfortunately, I don't know what the procedure is for recalibrating the speelo on a Super Dury. I do know what to do if you drive a pre '99.
Unfortunately, I don't know what the procedure is for recalibrating the speelo on a Super Dury. I do know what to do if you drive a pre '99.
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CJay
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Mar 16, 2000 05:38 PM
