Improve gas mileage on a 427 so ?

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#24 (permalink)

02-29-2020, 04:53 AM

joyridin'

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Join Date: Feb 2009

Posts: 1,696

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Quote:

Originally Posted by bwcobra15

I have 427W with quick fuel 780 carb, TKO600 w/.82 OD, 3.50:1 diff, 15" tires ... and I get 11 mpg AT BEST when cruising on the highway. I'm thinking i'm running about 2700 rpm at 75 mph.

I would have gone with the Tremec Magnum 6-speed with two ODs but the magnum is 3.5" inches longer and my driveshaft would be the size of a Dr Pepper can

I'm thinking of going to 3.27:1 differential .... I have 600+ ft lbs of torque that could pull it I think .

.

Mine is about the length of a Dr. Pepper can with the T56. It is great though to be cruising down the highway in 6th gear at 70mph pulling just 1900 RPM with 3.70 rear gears and 800 horsepower. It gets about 21 mpg on the highway and about 5 in the city.

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