anyone getting more than 6?
cause thats what im getting out of mine, is it unreasonable to expect around 10?

 

No the last time I check my MPG I got 8 but that was a road trip down the instate steady speed and no stops

 

69, it's going to depend on how you have the engine built and tuned, as well as the tranny and rear end combo. How is everything set up?

Just as a reference, I had a 70 GTX 440-6, auto, and 3.23 gears. Factory convertor. With reasonable driving, I could expect as much as 17 mpg on an extended highway trip at steady 60mph, IF I kept my foot out of it.

 

2x on that.
what modifications were done to the motor?
What kind of ratio do you have in the rear?

 

Here's a real world, "back in the day" setup

My 70 sixpack RR, WITHOUT the sixpack

70 RR 4 speed, Dana axle, 3.54 gear, G60x15 tires

3000 RPM at 70 mph, "hang on" A/C

headers, Edelbrock 180* intake, Holley 800 DP carb

stock engine, cam, factory dual point distributor, power steering

I was in the Navy then, and typically had two huge clamshell tool boxes in the trunk. Probably had an average of an extra 200 lbs in the trunk.

The car would not quite touch 14. 13.8. I didn't drive "all that carefully." When I got on the freeway, I GOT on the freeway. I wasn't all that careful at stop lights, etc. I didn't buy the car for MILEAGE, but back then, there were Cadillacs that didn't do much better, and weren't NEARLY as much fun to drive.

The car, and the only surviving photo:

https://moparforums.com/forums/f62/m...-back-day-596/

 

I get 1 mile a gallon while racing, maybe 2 while driving around

 

My 440 6Bbl got 12mpg at 55 mph and 8mpg at 65mph with 4.10s. My 70 Charger R/T got 15-16 with 2.76 axle and a 3310 holley 780. I tried the same size double pumper and mpg dropped greatly. If you are running a double pumper thats part of your bad mpg.

 

Smartest thing you could do if you actually want mileage is go to some sort of spread-bore vacuum seconary carb. Thermojunk, Quadrasquat, or even one of the smaller NON double-pump spread bore designs.

 

I had a 68 Cry T&C wagon w/ 440 I actually got almost 14 mpg on a trip to San Francisco. I had to through the holly away and put AVS carb on it,, That was when you could actually buy good gas...