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Mpg, tire size and ratio


Ranger4x4newb

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Joined
Jun 27, 2015
Messages
31
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Vehicle Year
1998
Make / Model
Ford
Transmission
Automatic
I've got a 98 4.0 with 33's all the way around. It's an auto 5 speed 5r5te with stock 3.73 and a body lift. Im getting close to 14mps hwyand about 11 city. Would rgearing to a 4.10 or 4.56 help? I do a good amount of street driving but some highway too. I'm not sure if there's a motor problem or tire size issue going on. It has new plugs wires and coil plus a k and n panel filter on it so i know there shouldn't be anything wrong there right?
 


gw33gp

gw33gp

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TRS Banner 2010-2011
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Location
Costa Mesa, CA
Vehicle Year
2002
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0 SOHC
Transmission
Manual
2WD / 4WD
4WD
Tire Size
33"
It is difficult to predict gas mileage with changes in tire size and gear ratios. Going to larger tires can pretty much assure you that you will get worse gas mileage.

I have been running 31x10.5" Michelin LTX M/S tires on the street for a long time with 4.10 gears. I got around 16 mpg around town and 18-19 on Interstates. When I put my 32x11.5" MT tires on for off-road the gas mileage would drop to 15 around town and average about 17-17.5 on the Interstate. I then went to 33x10.5" MT tires for off-road and installed 4.56 gears. My around town gas mileage is now about 15 mpg and 18 Interstate with the 33" tires on. With the 31" tires and 4.56 gears I get around 15 mpg and have not taken a long trip to know what I get on the Interstates.
 
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