[superchow]

I'm heading to a family event 1700 miles away in a few weeks and it got me thinking. Elevations tend to be between 5000 and 7000 ft once in CA, which means signifiantly lower air resistance. What sort of mpg could I expect to get with the following criteria:

Average speeds of 55-60 mph (i.e. including stops for sightseeing, eating, "pitstops"), driver and one passenger and some luggage. Car: 2007 Honda Civic EX with MT. No mods per se, just inflated tires to (sidewall max) 44 psi and using many hypermiling techniques. (Limited use of P&G due to average speeds).

The route goes from Olympia, WA to Redding, CA. Then via Hwy 50 to Arches NP in UT, and finally north to Rock Springs, WY.

I was conservatively estimating 40 mpg, but I'm hoping for something more like 45. Comments?