It depends on which engine you have in the 1970 Challenger. If you had the 318ci, you could expect to get 11 - 14 mpg. With the 426ci hemi or the 440ci six pack, you could expect 6 - 10 mpg,...
It depends on the version. There is the SL, RT. and SRT.
from a V-6 to a big V-8 Anywhere from $22,000 to $42,000
courtesy of www.NewChallengerStore.com