BLUAU

Hi guys, sorry if I'm putting up this thread in the wrong place, but I can't find an entry for F100's. Can someone help me by giving me an idea of what sort of fuel economy to expect from an F100 and which is the best way to go. I am considering buying a mid 70's - mid 80's (or thereabouts) F100 pickup. Is a 6cyl more economical than an 8? 302 or 351? How much improvement could I expect if it runs LPG? and lastly, I know it's each to his own, but what about auto verses manual. What do you think? Any help will be much appreciated. Thanks.

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98 AU Futura 6cyl auto. XR8 mags, front DBA slotted rotors, rear spoiler, louvre, towbar, grille mesh, Tickford snorkel, painted rocker cover, Fairlane leather wheel, blue dials, chrome inside door handles, chrome cup holder, XR blue/black leather T-bar shift handle, front lambswools, Ford tow pack, dash mat, rear console and front footwell lamps, slimline weather shields.

XLT96

Hi there.
I have a early eighties F100 SWB with 351 cleveland.
The truck runs on straight LPG and while producing approx 140 rear wheel
kws still managed between 5 and 6 ks per litre which i thought was reasonable.
Hope this helps.

Butchart

Six cylinders in Ford trucks are not great mileage makers on gasoline. The V-8s get equally as good a mileage. I have a 1988 F150 std shift 302 V8 and best I get is about 19 miles to the Canadian gallon. The earlier six cylinders in trucks were the 300 cu. in. and they were known for not getting good gas mileage, but otherwise a good motor.

fordrunner

I recently picked up an 87 f150 with a 302 V8 and it gets about 12 MPG. Sucks!! Like the truck though!!!

Butchart

Thats very poor mileage for a 302 V8, I get about 13-14 mpg pulling a 19ft fifth wheel with a 4 speed manual trans with 3.50 axle.

Torcher

My 88 f-150 gets about 12MPG on the highway and 8MPG in town with a 4 speed automatic.

fordrunner

I am pretty sure the reason my f150 gets poor gas mileage is because of the 3 speed auto. It revs pretty high at 55!

Butchart

You likely have a low geared rear axle ratio, like 3:55 to 1 or a 4:11 to 1. Automatics usually have a 3:05 to 1 or 2:75 to 1 ratios. The low gear axle would be why you rev quite high at 50-60 mph.

fordrunner

Yeah, How much work is it to get the tranny changed over to either 4spd auto or manual?

Butchart

Might be easier to change the rear axle ratio. First, find out what the ratio is, should be on your serial plate.