Slick 60's

I love my 390 in my '63. I can never get a decent mpg calculated though, because all the freeway time I get always hits rush hour in Phoenix and idles for 50 miles, and screws up the numbers. The last time I calculated from one of those trips, I got anout 7.
7?!? crap... I hope it really gets better than that!!!

Skip..... What setup do you have to get 15? that's incredible.

why dont you guys step the primaries down a notch and up the secondaries?

When we went to Knoxville last Wayne K. got 21 mpg with his 240 and 3.0 gears, with my 223 with 3.70 gears got 17.
Charlie

The 351w in my shorty gets 15 Imperial MPG on a good day. An imperial gallon is 20% larger than a US one, so that's roughly 12.5 US MPG.

I am currently trying to improve this by installing a 4 BBl that has smaller primarys that the current 2BBl carb. Keeping my foot out of it will be easy, I will simply have to say to my Scottish brain.. there went $10!

The 302 in my '78 F100 LWB got an honest and consistent 20 MPG, with a C4 automatic and stock single exhaust.

I have an old, tired, 216,000-mile 5.0 with EFI, backed by an AOD. It's in an '87 Grand Marquis, and it just turned out 26 imperial miles-per-gallon (22 US mpg) on a 6-hour trip last weekend. That was at about 70 mph too. It blew out 1-1/2 quarts of oil in the process, but all in all not too bad.

Of course a Slick experiences greater aerodynamic drag, which makes a significant difference, but I'd say there's decent potential with a fuel-injected 5.0.

All very convincing arguements. And just like my question about the shocks a couple weeks ago, I'm even more confused now :?

grumpy is my old work truck he has worn out leaf sprngs and coils hes a 1978 F150 short bed 4x4 dad bought it new and its well over 500k now we had a 351m in it and about 6 years ago it got a fresh 400m actually its a 406 if ya want to get technical, truck hasnt ever failed emissions and still the original 2bbl carb on it I get average 12 mpg city use hauling heavy loads from tearing out carpet and tile in houses to the dump ( which is what he does for a living) my 06 f 150 xlt isnt much better getting around 15 and its a good 1000 -1500 lbs heavier being a super crew with 6 1/2 foot bed. I honestly think the mileage out of grumpy is due to better tourque from having the 2bbl, I know it could be improved with 4bbl with smaller secondaries and also know id be driving around with my foot all the way down too