My test isn't scientific, but my Toyota has averaged 17.3 mpg in virtually every tank for the past 2 years. The best I ever ran with my lightest foot was 18 mpg. When I started driving with the tail gate down, it went up to 18.5 and sometimes 19, without trying to be light footed. About 10% better. It seems like its been a fairly consistent increase so now I always drive with the tail gate down. Just doing my part for the environment. [img]/forums/images/icons/laugh.gif[/img]