I drove my HiHy 8800 miles in 14 days this summer. From Petaluma, CA to Providence, RI and back. At a little more than 600 miles a day, we were driving the thing like it was stolen. I had 78 to 80 miles per hour average days on my way down from Washington state across the desert to Colorado. The truck will happily go 90 t0 95 all day long, with no heating problems and dead quiet while doing so. Going over Loveland Pass, I easily ran away from most of the other traffic, as my rig doesn't need air to get the extra horses, just the occasional downhill to get the battery topped off.

My trip average was 25.4 mpg. I ran premium. I ran 36 lb all the way around in the Michelens that the thing came with.

My normal tank average with a mix of city and freeway driving is a steady 28.2 to 28.6. I'm no hypermiler; I coast when I can and work to avoid stopping at lights as much as possible. In town, if I am going far enough to get back the mileage wasted during warm-up, it's easy to get 31 mpg.

I would love to drive one of the Highlander's or Lexus that wont' get this kind of mileage. I am really curious to figure out why they won't....?