fuel mileage

[nightcop]

did a 4.0L motor and tranny swap from 1992 explorer to my 1988 ranger. Motor rebuilt completely. running 3.73 gears on 265/70 16 tires. Only getting 12 mpg. figured i should be getting closer to 18 or 19 mpg. 1998 ranger gets 19 around town on same motor and tires. dont know what I did wrong any help would help or ideas.

 

[Andy D]

What kind of MPG were you getting when the engine was in the Explorer ? Wheel and diff combo isnt the best for MPG. Is the truck lifted? When was engine tuned last?

 

[PanamaExpat]

If your MAF isn't working correctly you will get horrible mileage.

 

[doorgunner]

What RPM is the engine running at 60 mph?

 

[nightcop]

motor only has 6k since rebuild.. everything was new, MAF, computer, plugs and wires. fuel pump filter, explorer was getting 22 mpg only change was diff,, it had 3.55 gear.