Holy cow! Did you realize there is 2 years and 4 months between post #58 and #59 ??? Tall, narrow and lightweight tires can help in overall MPG. The most "economical" tire for the best MPG is the TOYO - Open Country A/T in 255/70R18 (only 10.3" wide, 32.1" O.D., weighs only 41 lbs, and set to max PSI of 35 per sidewall panel). Only drawback is the VX will look like it's on skinny wagon wheels.