I would like anyone answer what mileage they average on LONG highway trip no city. Like 200-600 miles a day. Reason I made this thread because I going make 600 miles in 1 day so I want get best mileage since it come out my wallet.

What tire size and gear ratio what speed and rpm.

Here mine

265/75/16 mastercraft courser HT gear 3.73 Speed about 57-62 with rpm hoover 1600-1800.

Get 18.57 mpg out 200 miles a day. Drove for 3 days before refill it was 650 miles to 35 gallons but it was COLD so it affect little mileage.

 

Well it sounds like you are getting great mileage. Most of my longer trips are towing at around 18k gross. Trip around 780 miles one way to Eastern Tennessee, I averaged 10.72 MPG's.

Last weekend I took a trip 540 miles round trip empty, averaging 15 mpg's.

Towing and empty I drive the speed limit, usually 70-72 at around 1900 rpms.

3.73 gears with 315-75R16 Nitto Trail Grapplers.