4.0 Fuel Mileage not right - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 3 Days Ago
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Icon5 4.0 Fuel Mileage not right

I have a 2006 Ranger XLT 4x4 with a 5 speed auto. I've been reading online that I should be getting between 15 to 18 MPG for this model. It has a towing package and 17 inch tires.
I've filled the tank up numerous times and have been watching my mileage and from what I see I'm only getting about 10 miles per gallon. The truck originally came out of Pennsylvania and I'm wondering if it had been programed for towing and not fuel economy. Other than that it runs fine and drives strait with no other issues.
Am I delusional or is it something else????
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Welcome to the forum

First thing I would do is to check ODOMETER, if previous owner put on larger tires then odometer and speedometer will be off, will show lower miles than actually traveled
So if you use the odometer to calculate MPG..................then MPG will be lower than it is

There are Speed Apps for smartphones that can tell you speed and distance to check your trucks readings.
Or mile post markers on highways

If you look on the drivers door edge there will be a sticker/label that will have your Stock Tire size listed, thats what the speedo/odo was setup for, so you can see if you do have taller tires.
Computer can be reprogrammed for current tire size

Trailer package often came with 4.10 rear axle ratio which will have lower MPG at highway speeds, but only 1 MPG maybe 2

There is no change in computer software for towing, either for engine or transmission.

The mechanical issues like axle ratio, taller stance, tire width all make for lower MPG
Low to the ground vehicles and skinny tires get best MPG
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That I'll do. I did goof up on the rim size, The tires are 16s not 17s, but the tires are fairly big and they are pretty new looking (deep tread). Might have been put on at the dealership before I bought it. Thanks for the input.
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