Slant Six mpg's?

Sinister. said

Something else to keep in mind is inaccuracy with the speedometer/odometer. Even if the right gear is in the transmission, if the wheel size or tire size is off from EXACTLY what that gear was made for, they will both read incorrectly. I'm averaging 8/12 (city/highway) in my Dart though it is a 318, but at 55 mpg, my speedometer reads 50.

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I here you :happy10: I thought I was getting 27 to 29 MPG till I figure the wrong wheel and tire size I am running :-D
It's hard to say unless you have a friend with the correct mph odometer to follow and get a reading at lets say 60 mph . then take a HWY trip for 100 mile then refill the tank and do it again on the way back :happy10:
I am getting 24 on the HWY in my 66 170/ offy 4 bl 390 Holley and split manifolds and I am replacing axle bearing and seals, This might give me an extra mile or two :happy10:
Very good point Sinister 8)