a note on mileage

A friend pointed out to me that his parents get 49 mpg on their Prius and my photo was showing we're getting below 41. I just want to comment that when you're in a state with 75 mph as the speed limit and then head into the mountains, mileage drops. We'd been averaging about 44 or 45 until then (the older Priuses like mine get lower mileage than the newer ones).