Hack
15 Year Member
I believe it's possible for a big block to get 17 mph if it's babied at maybe 50 mph (highly unlikely though), but I don't believe it's possible for someone to actually drive that way . If you drive your big block in a manner that gets you the same mileage as my straight six, you should be forced to trade cars with me. I promise to drive it properly.D.Hearne said:I believe him. My 427 Stang used to get 15-20 out on the highway at 70-80 mph. You're talking about an 11+to 1 compressioned big block that takes very little throttle to keep it going at those speeds. If you can keep your right foot disciplined, up to 20 mpg is possible. My Mom's old 70 Olds Delta 88 with a 455 used to get 20 mpg regularly at freeway speeds.
And at 80 mph the engine in an older non-overdrive car is going to be turning over plenty fast. I think your speedo/odometer must have been off, D. Hearne. No disrespect intended, but I think I would actually have to see this one before I'd believe it.