The car loves sea level, i live at 4500 feet, and thick air plus the cold temp, high of 35 or so, are very, very noticable. Averaged just over 30 mpg for the trip from Las Cruces to Bellingham WA. Bst driving was through the Mt Shasta area. Speed limits on I-5 are low. Roads in Anchorage are fine but you can see all kinds of patched potholes. Good on the city for keeping up with them they must have a big crew.
Just to be clear, the marine highway is a ferry so it spent four and half days belows decks serving as a dog house for the pooch. No messes, TG. Counts as a road tho since you drive on and drive off...so a biker I met on board told me.