I recently purchased prius which has much better mileage than my previous car so I'm monitoring each of my trip. I actually observed this and it is true in my

I recently purchased prius which has much better mileage than my previous car so I'm monitoring each of my trip. I actually observed this and it is true in my case; I do get better mileage when choosing a route through a canyon than when using regular freeway. I suspect though that the real reason is that it basically affects how I'm driving. When I ride in a canyon I can't accelerate much because there are constant turns, while on straight freeway I most likely will accelerate. This also would explain why most of the time I get better mileage in traffic (the EV is used most of the time).