6-8 in town if I rod the snot out of it, 8-10 if not, 10-12 highway. 12 if I cruise at about 60?

 

I get about 18 all throughout. I shift to overdrive going 25 to get insane mileage

1980 dodge d150
Half ton Stepside 2wd
225 slanted 6 with 4 speed OD
I think my carb is a single valve
My trucks just a cruiser though.

 

i get about 6 no mater what. city, towing, highway, even if i drive it nice. 1992 dodge ram 318 auto bone stock 82,000 miles its got a fresh tune up too. dont see how you can get above 10

 

mythbusters proved that having the air on makes no differance on gas mileage or power while driving

 

6mpg around town!

JUST got the driveshaft/axle shim situation squared away though, and took it on the interstate for the first time in 9+ years on Tuesday. I'll check the mileage again here soon, and see if it's improving!

 

Gassed back up at 100 miles on the trip odometer - 36 of that had been on the interstate. Took ten gallons exactly, so I'm up to 10mpg with some interstate driving -

 

91, 5.2L 3 speed auto rebuilt engine with not cat and smog pump. So far 14 mpg this fall and a high of 16 rural driving.

 

I just made a 90 mile round trip, and I got just shy of 14mpg. 1993 W150 318 magnum, NV4500, stock gears, 33-12.50-15s. Only mods...exahust, and K&N air filter. 270,000 miles on the clock.

 

The post 80 /6's were handicapped with the hydraulic lifters. On earlier versions you could tighten the valve clearance a bit (0.008" In, 0.10" Ex instead of stock 0.012" In, 0.20"Ex) and the engine gained quite a bit of torque at cruise rpm which helped economy (35+ mpg in a 64 Valiant).

My 80 D-150, with 225, wide ratio 4 speed and 3.55 axle, radial tires, got 21 highway and 17 around town but here in my part of CO you can remove the cat (it was plugged anyway) and other gas wasting emissions "stuff", tweek the vacuum timing for a bit more mid range advance (move up one grade in fuel, btw) and get a tonneau cover or shell (either is better than an open bed but my numbers are with an open bed).

Hope this helps!

Budd

 

1993 D150 RLB, 3.9 V6/ a998 AT. I generally get around 17 in town and 19 highway. Truck has 103,000 miles and runs great.