The 1991 Pontiac Grand Am gets 19 miles per gallon in the city, and 30 miles per gallon on the highway. It can hold up to 13.6 gallons of gas.
A 1991 Chevy Suburban will get 11 miles per gallon if driving in the city. It gets around 15 miles per gallon on the highway.
30 miles
does a 1991 thunderbird torque converter have a drain plug
1 gallon of full streangth should be plenty, butch
7 miles
Depends on which engine it has. Try a Google Search.
29 City / 35 Highway
between 18-25mpg depending on how you drive it
13 mpg
If it is a 5.0 from a 1991-93 Thunderbird/Cougar, then yes
15 city and 19 highway.