In that case go here and compare

http://www.fueleconomy.gov/feg/PowerSear...amp;srchtyp=ymm

They test them all the same way in the same conditions so you get a good comparison, however it may not be the actual miledge that you get. I tell customers to take what they currently get and look at the difference. They even have a $$$ savings calculator, it will vary depending on your actual MPG/miles driven/cost of fuel but it gives you a basic idea

Looks like about 2mpg better in town and on highway.