I am about to replace my '97 SC 4x2 with a 2000. My '97 was a 4.2 w/manual and 3.08 axle. The new truck is the same except for a 3.55 axle. Anyone know the approximate effect this will have on gas mileage? Thanks.

 

What kind of mileage did you get before? I think you would only loose about 1 mpg on avg.

 

If you do mostly city driving, then your mileage could actually go up.

 

Hey I have a 4.2 with a 3.55 and I get about 375 miles a tank 25 gallon tank.....brb get out the calculator.. ok I get 15 miles to the gallon. Thats no highway driving though and with 32 inch tires. Hope it helps.

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'97 F-150 XLT Clearcoat Red
4x2
4x4 wheels
Stepside, K&N, bedliner
32inch tires,flowmaster
tint, matching ford sticker
5spd fully loaded, hidden hitch
Comming soon:
spark plugs/wires,leveling kit,toolbox,
bed rails,push bar, CB with whiplash,
clear corner lenses,brush guard, blackouts,
edlebrock shocks, hypertech, K&N induction system,KC highlighters,
bed xtender, BOSE audio or infinity gold, disc changer,
side steps, dixie horn, white faaced gauges, and those small fender flares some 4x4's have,
matching boddy color of course, and some of those door guards,ventshade visors, power pulleys, that is all
i can think of right now

 

I used to have a 98 with the 3.55 and I got between 15&17 mpg if I kept my foot out of it.Its kinda hard to do that though because the gearing sure helps the acceleration.You will probably find youself with the petal to the metal more.

 

99 4.2 5 speed 3.55 rear I get 19.5 in town with air.

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------------------------- 99 SILVER XLT/REG.CAB/4.2/5SPD/3.55/K&N Airbox Mod/Gibson Sweptside/Westin Black nerfs and now SuperChiped