With a 5.7L engine, you can expect 11 mpg city, maybe 15 hwy. That is what mine gets.
A 1989 Chevy Silverado Pickup Truck will get between 14 and 16 miles per gallon. This does vary slightly from person to person, depending on how well the truck is taken care of etc.
The average miles per gallon for a Chevrolet Silverado is 16.68 miles per gallon. This is a rough average as other sites indicate it is eleven miles per gallon. This will depend on your speed.
Silverado 1500 gets 16/21
10-14 mpg is what my silverado gets
16 mpg
The Chevy Silverado 1500 averaged about 16.5 miles per gallon in 2013. Additionally, it averaged 15.6 miles per gallon in 2012 and 15.3 miles per gallon in 2011, so it has improved in the last few years.
I have had a 1996 Chevy Silverado for 5 yrs. 200k+ miles and I am getting about 13 miles per gallon.
The average full sized diesel pickup truck gets about 26 miles to the gallon which is about 10 miles to the gallon more than a gas truck. This is due to the fact that the diesel engine is far more efficient then the gas.
The CXT gets 8-10 miles per gallon, and has a 70 gallon tank. That may be your best choice.
10-1510-15
A 2004 Chevrolet Silverado gas tank can hold 26 gallons of gasoline. It can travel an estimated 14 miles per gallon in the city and 19 miles per gallon on the highway.
I'm not sure exactly what you are wanting to know so I will just assume that you are asking about the gas mileage. A 2007 Chevrolet Silverado gets 19 miles per gallon (highway) and gets 15 miles per gallon (city).