How much of a decrease in mpg's with bigger tires
#1
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How much of a decrease in mpg's with bigger tires
I'm considering putting some BFG A/T 315 70R17 on my stock early 2004 truck. I'm just wondering how big of a decrease im milage can i expect. I have the 3.73 gears with the 48RE. With the stock 265 mich's on I get 16-17 in town, 18-19 going 80 down the freeway, and 20 + on the highway. At 3.40 a gallon I would hate to regret my tire decision. Thanks for any info
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Running 38's on factory gears with transmission reprogrammed. Getting about 19 around town and 22 on highway, atleast that's what the computer says.
#4
in town mine went down a little , did not loose any on highway might have gained because of the rpm drop i average 18 - 19 on combo of town highway , straight highway long runs i get 20 - 22 depending on speed
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#8
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Lost about 2 mpg when I went from stock to 35/12.50/17 Toyo MT's. This is figured after recalculating for the change of tire size. A buddy lost about the same when he went to 315/17 BGG AT's.
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I lost some around town and gained on the highway by putting 265/70x19.5 tires on mine. It was about a wash for me. I definately do better on the long highway trips but it ended up about the same for my normal commute.
I know the higher gearing from the 34.5" tire hurt mine around town even more because of the slushy stock tranny. I am planning on a new modified tranny this winter and know it will help regarding the mpg.
Jeff
I know the higher gearing from the 34.5" tire hurt mine around town even more because of the slushy stock tranny. I am planning on a new modified tranny this winter and know it will help regarding the mpg.
Jeff
#10
I put 315 on mine and gained .5 hand calculated in town.. I also dont drive it like I stole it very often. really helped on the highway cause I can now cruise @ 70mph 18-1900 rpm in stead of 70 @ 2150...
#13
I did the Hummer H2 wheel thing... 315-70-17.. I have seen 2-3 MPG loss all around. This is all based on the overhead computer.
Also noticed a decrease in braking performance. The ride was better, less bounce and bucking. I do have the Bilstein 5100 on.
Also noticed a decrease in braking performance. The ride was better, less bounce and bucking. I do have the Bilstein 5100 on.