What kind of mpg are you guys getting on a g20? My 78 runs great. In the three weeks that I've had it, I've already driven from Denver to SE CO and back, Denver to Santa Fe, big loop and back, and Denver to Moab and back, without any issues. But holy shit the gas is killing me.
Never actually checked MPG on the GMC but I think it's pretty good...about 15 to 18 MPG in the summer maybe. Our blue '95 G20 I have checked it while towing the TT (about 2300#) and it's about 8 to 8.5 MPG in the foothills. Our old Ford will get between 9.5 and 10 MPG summer, winter, uphill, downhill, towing or not because it don't seem to notice if there's anything back there....
There's not gonna be much MPG difference between the BB and the mouse motor. As an old friend of mine used to say, "you're pushing a brick!" and the 454 just don't have to work as hard. Add some extra weight or hills and the 350 has to work it's azz off.
Last edited by CatFish; September 25th 2017 12:52 pm.
First road trip was 14.9 mpg, second was 12.8 mpg. Doing a repeat of the first trip this weekend, but this time I'll have cruise control. Curious to see what that does. Fairly flat route with one "shift down" hill. 1984 305/700r4 with shift kit. The last trip I stopped for gas at my non-usual place, and I could tell the van didn't like it. Weird gas and headwind didn't help the mpg.
I have hand written calcs from the first owner's road trips, and he was getting 17.7 mpg back in 1986. Today's higher speed limits and ethanol additives will likely keep me from getting anything better than that.