15 city and 19 highway.
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.
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
Depends on which engine it has. Try a Google Search.
3200
85 mph.
YES it is.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
Was built for R12, can be converted to R134a.
In the gas tank.
It is inside of the fuel tank.
1157 1157
.035 gap standard and stock