Thread: Drastic increase of gas mileage on my F 150

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Just finished firing my '91 F150 6-in a row to break in the cam after a rebuild, so I will be very interested in hearing of any mileage increases with the larger tires. Good luck.

Well I had a big set-back on getting my "Drastic increase of gas milage on my F-150"; I've been hauling in scrap iron and my big tires started scrapping the wheel wells on the curvy roads, actually only the drivers side I got back to my son place and changed back to the stock size (Picture of truck in front of my house). Total weight on trailer and F-150 was 3900 lbs, got $282.00

Other findings with the big tires: Tested speed with me pacing my wife's car, her at 30 - I was doing 25, her at 55 - I was doing 46. I took it up to 55 mph and I'm sure I was doing 70.

First load of iron hauled weighed 3100 lbs and the big 300 cubic inch six had all kinds of power (175,000 miles on it), even drove in overdrive with tires scrapping on the curvy road.

Have I given up? No! Might just have to take the sledge hammer to the wheel wells for more room though.

Why not just add a set of helper springs?

http://www.truckcomponentsonline.com...-_c_254-1.html

I all ready have helper springs, and the rubber cushions are tight against the axle when hauling that much scrap.

A set of overload coils should give you some added clearance. I had a set on the 72 F100 I had with tires similar to yours and a load of gravel would just even out the stance.