What kind of mpg's can you expect from an auto SB A-body? The engine doesn't necessarily have to be built up. But something around stock. Is there any ways of improving it to get around high 20's on highway? Personally I drive about 60 mph on the freeway, but occasionally go 70 on longer trips. Very conservative driver. I know a member here had a 68 Barracuda trying to get 30 mpgs but he sold it for his new business.