I chronicled my quest for the most energy efficient alignment settings here: Results of testing front toe-in vs energy usage Today I went for a 30 mile drive. The car is a P85+ on the factory 21" tires, so energy usage tends to be higher than cars with 19's. I did nothing to minimize energy usage. AC was on the whole time, ambient temp 28C/82F. I did 70-75 mph on the highway for 15 miles, and then 15 miles in town where I followed the general flow of traffic and stopped at a few lights. Again, no attempts at hypermiling whatsoever. I was a bit surprised (and pleased) to see 255 Wh/mile at the end of the 30 miles.