Fuel mileage and big tires

Joined
Jul 29, 2005
Messages
276
Location
Bakersfield, Ca
 
 
 
So i went from 235's to 33's, this is the first time i filled up since i got the tires and man i think the math came out to about 9 miles to the gallon, from about 13. So the question is how off is my trip odometer in miles? That might have something to do with the horrible gas mileage. I also used the sea foam and i think my pluges might be fowled so i will change them next week. Thanks.
 
Joined
Apr 23, 2005
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3,246
Location
Oregon
 
 
 
If you had 33s, 100 miles on the odometer on 10 gallons of gas is (100/10) x 1.15 = 11.5 mpg.
 
Joined
Sep 12, 2003
Messages
3,476
Location
Tacoma, WA
 
 
 
correct, the 33"s naturally have a larger circumference, therefore you go farther per each rotation. so overall you travel father than your odometer would indicate since it is calibrated for the smaller tire.
 
Joined
Dec 22, 2004
Messages
261
Location
Bend Oregon
Sorry to hijack, but dose Toyota have diffreant spedo drive gears to comensate for tire/gear changes?
Thanks
Jonathan
 

esh

SILVER Star
Joined
Apr 22, 2003
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2,054
Location
Oregon
 
 
 
I have 33's and I am 11 mph slow on the reading at 55mph. My gps showw me doing 66
So you're saying you're about 20% off. Which can be in the range as tire manufacturers are all over the board with what 33" means to them. Tire pressure affects it as well.

I was getting about 16-17mpg on stock tires and dropped to about 14-15mpg when i went to BFG AT-KO 33x10.5s. It drops further to about 12-13 when fully loaded for expeditions with the tent and rack on top. Wheeling is about 10-11mpg.
 
Joined
Mar 31, 2006
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1,102
Location
Abbotsford, B.C.
The only accurate way to really work out your fuel consumption numbers is to use an accurate GPS to get your odo calibrated. You may be surprised at what your actual compensation factor really is. But from what you said 15% is probably pretty close.
 

REKCUT

SILVER Star
Joined
Jan 5, 2005
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4,478
Location
Rogersville, Mo.
 
 
 
I never really cared about mpg. Its not my daily driver. I do keep track of the miles I go on a tank to make sure everything is constant. I can get about 215 miles on a tank by my odo wich is off because of the tires. I have the factory gears.
 
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