So i just averaged just over 26 mpg on a 700 mile trip to northern Utah from California. Not to bad i think

 

Might want to provides details of the vehicle - year, engine, trans and any major mods. And trip conditions - weather, average MPH, etc.

 

95 Z28 ( california car) airfoil,k&n fipk, cast instake elbow,1.6 rockers,tb coolant delete,10.5 mm wires custom cat back 3 inch bullet muffler , average speed was 73 mph. The trip conditions were great up until i got about an hr south of Salt lake. Then the heavy snow fall started and was slowed to a 15-20 mph crawl for about 2.5 hrs.

 

That is good mileage, what transmission do you have?

 

The trans is a 4l60e