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Old 05-12-2005, 00:20   #1 (permalink)
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confused Fuel Economy

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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Old 05-14-2005, 03:04   #2 (permalink)
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Re: Fuel Economy

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.
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Old 05-20-2005, 21:23   #3 (permalink)
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Re: Fuel Economy

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.
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Old 07-07-2005, 18:34   #4 (permalink)
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Re: Fuel Economy

I recently picked up an 87 f150 with a 302 V8 and it gets about 12 MPG. Sucks!! Like the truck though!!!
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Old 07-08-2005, 20:58   #5 (permalink)
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Re: Fuel Economy

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.
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Old 07-10-2005, 15:19   #6 (permalink)
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Re: Fuel Economy

My 88 f-150 gets about 12MPG on the highway and 8MPG in town with a 4 speed automatic.
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Old 07-10-2005, 23:09   #7 (permalink)
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Re: Fuel Economy

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!
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Old 07-13-2005, 20:57   #8 (permalink)
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Re: Fuel Economy

Quote:
Originally Posted by 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!
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.
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Old 07-14-2005, 19:16   #9 (permalink)
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Re: Fuel Economy

Quote:
Originally Posted by 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.
Yeah, How much work is it to get the tranny changed over to either 4spd auto or manual?
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Old 07-14-2005, 22:42   #10 (permalink)
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Re: Fuel Economy

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