Fuel economy 4.2l

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12-23-2015, 12:40 AM

#11

BlakeA

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Join Date: May 2015

Location: West Monroe, LA

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Quote:

Originally Posted by Tredeh

The good old 4.2.
When I was driving 80 miles of highway 5-6 days a week (60 mph, hilly terrain) I averaged 21-22 mpg. Thats with a 5 speed and 3.55s on a regular cab swb
I know a guy with an identical truck, but his is an auto. He drives roughly the same amount of highway miles I do but averaged 18. He doesnt drive it easy though.

That's what I use to get. I have a crew cab 2wd auto 4.2 with 3.55's. After my lift/level and going to 285.75's from 265.70's it's dropped. Thinking about re-gearing to get a few mpgs back along with an SCT programer.

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11-10-2016, 09:41 AM

#12

Nailer45

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2006 f150 xl 4.2 with 5 speed. 98,000 miles on it.
best gas mileage I ever get is 17mpg on long trips and 14-15 in town.. when hauling a 16ft enclosed tool trailer I only get 10-12 mpg

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10-24-2017, 05:58 PM

#13

Nailer45

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Update on mpg

I installed a livewire TS tuner and set it in econo mode and am now getting 17mpg in town and 21 mpg highway.

Towing my 16ft tool trailer I get no lower than 15mpg.

4.2 V6 309 rear end 5 spd manual 110,000 miles