Gas mileage 225 Slant 6

Princess Valiant said
I consistently get 16 mpg with my slant in a 68 dodge dart 2 door H/T with a 1976 OD 833.

I am kinda a lead foot and with a slant you have to be a lead foot to push it to keep up with today's traffic.

Don't expect much from a slant, sure it's only a six cylinder but it's also a heavy and very old engine that was designed to run at 55 mph or less, more so on the less part.

You should be better than that with an OD 833. Going from a 1bbl to a 2bbl, running HEI ignition and opening the exhaust to 2 1/4" took me from 15mpg to 21mpg and that's averaging 75mph on the freeway without traffic.

It's still a slug compared to newer vehicles but the 2bbl actually helped me keep out of the gas as hard.