Gas mileage


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By junkyardjeff - 12 Years Ago
When I get the 292 built what can I expect it to do on gas mileage,it will be basicly a stock rebuild with a cam for low rpm torque if one is made. I will have a 3 speed automatic trans and 3.00 gears,since I never really driven a car with a Y block very far just wondering how they do.
By Larry D - 12 Years Ago
My '57 Fairlane had a 0.030 over 292 with mild cam 4-barrel and dual exhaust, coupled to a Ford-O-Matic and 3.10:1 rear gear it would give 21 mpg on the highway if you didn't push it over 65 mph.
By peeeot - 12 Years Ago
That's pretty impressive Larry! What carburetor are you using? Any alterations to the stock distributor/ignition?
By Ted - 12 Years Ago

I’ll add that my ’55 Customline with its 0.020” over 272 when it had fresh rings would hit the 21-22 mpg numbers regularly with a 500 cfm Holley on an ECZ-B intake and the Isky E4 camshaft. While 15-17 mpg is the norm now, it’s mostly town driving with less than ‘egg on the foot pedal’driving. And with over 125K miles on those same rings now, ethanol laden fuels, and a timing set that continues to retard the cam timing as the chain stretches, some reduction in the fuel mileage is to be expected as the miles continue to add up.
By Larry D - 12 Years Ago
Using the factory '57 Holley 4 barrel carb & manifold from a 312 and a Pertronix unit in the stock distributor with an initial setting of 8 degrees btdc.
By Frankenstein57 - 12 Years Ago
I have a 292 stock, headers, 3.89 gear, 3-speed od, and got about 16 on the highway. I'm thinking of trying a 3.70 gear. I was running the autolite 4 barrel, since switched to a 600 and haven't re-checked the mileage
By junkyardjeff - 12 Years Ago
My 55 has 3.00 gears which will stay after the 292 is installed,I need to get a tach on my present motor and see how fast its running while on the highway and build the 292 accordingly. The 351 is only getting 16 to 17 on the highway and was hoping I could build the Y block to do a little better if possible.
By Pete 55Tbird - 12 Years Ago
I don`t think that your gas milage will be more than 18/19 overall even with a very light foot. I owned a 1955 Club Sedan two door with a straight 6 and O/D for about a year and a half in 1959 and if I got 21 or 22 I thought that was great milage. Remember at that time Amoco unleaded 104 Octane gas was 35 cents a gallon and Volkswagon was bragging of fantastic 25MPG. It was not that unusual for a car to get 8/10 mpg. Pete
By junkyardjeff - 12 Years Ago
The crappy gas we have today might have some effect on the mileage of non efi motors today.