Check fueleconomy.gov. In my 2004 Venture we get 19 city 25 highway.
being a 454 it doesn'y get any kind of fuel mileage
134A freon
for my 2000 Chevy Venture I use DexCool. It is the ONLY one recommended by GM.
Check out www.fueleconomy.gov
15 to 18mpg
I have a 2002 Chevy tracker and it gets anywhere from 28 to 25 miles to the gallon.
Rated at 20 city / 29 hwy.....
10ish
For a 2003 Chevy Suburban (all engine sizes), the recommended viscosity is 5W30.
R-134A
depending on your mileage and wear, anything from 10w30 to 10w40
I have 1 and I'am getting 14 to 15 mpg In city, trying to find ways of improving the mileage of it