70 mpg average shouldn't be difficult: my lifetime average is at 70.9 mpg, for the 85K miles I've driven over the nearly 6 years I've owned it. My typical drives are probably less conducive to high mpg than most, too. I frequently drive up this road
Nevada State Route 431 - Wikipedia, the free encyclopedia for hiking & skiing, spent a couple of years travelling regularly to the Bay Area over this road
California State Route 88 - Wikipedia, the free encyclopedia, and have been known to head off on desert dirt roads to places like this:
Toiyabe Range - Wikipedia, the free encyclopedia Though I must admit, I don't always exceed the posted speed limits :-)