Mine is a brougham ls. the windowe sticker says 17...but I had a system in the trunk and a vacuum leak and I was gettin like 7...i took the system out and now i get about 12.
35
My 1989 Chevy Caprice Classic with a 350 CID motor has a 27 gallon tank.
25.6
one
23 gallon for sedan, 21 for estate
Around 3800-4000 lbs
23 gallons
20 miles to the gallon 20 miles to the gallon
15 miles to the gallon 15 miles to the gallon
it can get 8 miles to the gallon
18.5 miles a gallon
5-6... depending on options.