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Does anyone know the difference in gas millage, between a 5.0 and a 5.8 with a manual, in the 89 f-250
 

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i know the 534 (the 8.8L) in the 82 F750 got 3 on a good day...
 

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Does anyone know the difference in gas millage, between a 5.0 and a 5.8 with a manual, in the 89 f-250
I would venture a guess that the difference around town would be about 12---15% more. On the highway it's probably closer to 6--8% more than the 302.

Also when you get an extra $125.00 or so in your hand someday, you may wanna Google the Six liter Tune Up. Kicked my mileage up on the '89 Bronco with the 5.0 from 11/14 to 13/17 mpg and will pay for itself in a couple/three months.......
 

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All depends how driven, how loaded & how tuned. Our '69 Fairlane 500 wagon (3600Lbs), loaded with all options, 351 4bbl & dual 2 1/2" exhausts, plus a 27-gallon auxiliary fuel tank would always get superior miles per gallon to our '69 Torino Squire (3400Lbs) with fewer options and a 302 2bbl. Both cars had the same auto trans ratios, as well as 3.00 rear end gears. So how could the 351 beat the 302 on fuel mileage?

Driven reasonably, in a mix of traffic conditions, 1) the 4bbl can usually run on its primaries, smaller than the 2 venturis of the 302's 2bbl , 2) the 351's longer stroke gives it more low speed pulling power (can move the car into the higher gears more quickly), and of course 3) the 351's low restriction dual exhausts didn't hurt either. Obviously, if the power of both engines was being used to the maximum, the 351-4bbl could drink more fuel than the 302-2bbl, at least until the driver(s) were caught & handcuffed!

J.R.
SoCal
 
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