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First post here. I might be pickin up a 79 Bronco tomorrow morning. It has the 351m with about 127,000 miles. It has an edelbrock carb and an aftermarket intake. For tires it has some 31" M/Ts, unsure of brand but also comes with 34" swampers. My question is, what can I expect for gas mileage? I drive through town for about 15minutes everyday for work. I have been told i could expect anything from 8-15, seems like a huge range to me though.

Thanks!
 

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You might be able to squeeze a few more MPG if you know what gears you're running. For 31's, I would run 4:10's, for 34's, I would go with 4:56's. I run 33's on 4:10's and get around 10-11 on the highway at 70 MPH, if I drop down to about 55-60, my MPG goes up (of course).
 

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Its like when I bought my Surburban...I asked the salesman what the MPG was....he said If I have to ask I cant afford the truck....M 78 does ok is I will keep my fat ass foot off of its throat. I love keeping my foot on her though... congrats on the 79 FSB and welcome.
 

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My '79 is 460, c6, 205, d44 and 9in. Tires are 35x12.50x15 and tuned up and with a clean air filter i get 10-11mpg. Dirty that air filter though and it drops to about 7mpg.

Oh yeah, Welcome to FSB :beer
 

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I'm running 33's on my 79 with the 400. I get around 9-10 in town and slightly higher on freeway if I keep off the throttle.
 

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I run a midly overstock 460 with 33's and a poorly rebuilt holley 670cfm, and still make about 10-13 as long as i keep my foot out of it. but a lot depends on the engine ware. how long has it been since it had a good machining? older the build, worse the milage.
 

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i get 11-12 out of my 400 with a 650 edelbrock carb and c6 with 31s not sure what i have for gears but im betting on stock unless po changed them which i dont see y he would cause it has no lift and 31s
 
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