Just talked to our test guy for the meth, he said he got 30 more miles out of his tank then he usualy gets, this is on a RX-8 with a supercharger kit with the meth tuned to come on under high load over 4000 RPM. He burned through 2 quarts 50/50 mix and ran out about 50 miles short of the end of the tank. Were installing a 5 gallon tank in his trunk next week and im going to work on a cruzing spray tune to see how well that works. Ill keep you posted, I might just install it this week on the VX. At the moment im getting 280 to 310 per tank on the highway.