I had to take a long trip from my home in WV to a friends home in Canada. Keep in mind this is ALL interstate and I get the speedometer between 65 and 70 for 90% of the trip. I used Exxon gas for the drive. I went from 20" Limited Factory wheels with Cooper ATR 275/55/20 to my new ProComp 18x9 Cooper Zeon LTZ 285/60/18. With the originals when I made this trip I averaged 315 miles per tank but with the new ones I got right at 345 before I had to fill up. Not exactly scientific but still interesting. Not to mention they are very quiet and handled great both on the road (very wet and rainy) and off road (pulled a 3 horse trailer with 2 horses in the mud). Depending on how they wear, these are great tires.