75-80 miles per hour equals about 42 MPG (more if the wind is with you).

We've driven to Oregon and back (3,000 miles roundtrip) as well as Arizona and back (2,500 miles roundtrip) at those speeds with 2 of us and camp gear and one blind pug. No problems doing the speed limit or mountain passes. Engine noise goes up as you climb (increased RPM) but the going down the other side is pretty quiet!

This is a great car.

Also, locally, we've carried 4 adults, one 2 year old in a baby seat, 4 bikes on my bikerack, and a baby cart (not sure what else to call the 2-wheeled tow-along cart for a bicycle?) in the rear cargo area, up 2,500 feet elevation and back with full A/C (90 F + summer day), and still got 49 MPG! This is really, really a great car.

'04 Seaside Pearl #7. Fumoto oil drain, mudflaps, rear bumper scuff protector & rear warn system, compass mirror, EV mode button, 8" subwoofer in right rear cubby & 6" subs under seats, power lumbar in the front seats, Coastaletech hitch w/ Aspen bike/snowboard rack. iPod2car, 2 amps, Alpine component speakers, and DVD video, solid 47 MPG @ 70000 miles.