All depends on the engine in it and the rear gear ratio.
Yes.
if the buick is also an A body they will work as the chevelle is an A body.
2,800
The Chevelle convertible was available from 1964-1972.
No.
the 1970 Chevelle had 500 hp stock and 500 pounds of torque. The 1972 chevelle 454 was SAE rated @ 270 horsepower
A 1971 Chevelle was available with every engine in the Chevrolet line-up from the LS6 454 to the 250 cid inline six. With that in mind, the mileage would be somewhere between 4 mpg and about 25 mpg.
Usually a 350
In the Transmission
Depends on engine, transmission, gearing, driving style, etc.
NO.
The features that came on the 1972 Chevelle were very different from all of the other model years of the Chevelle. The features were standard light up air bags, reclining trunks and 1973 technology that wasn't seen until the next year.