This week I'm up in Minnesota visiting a cousin and uncle. I drove up Sunday (1100 miles each way). Through the mountains in western MD and western PA it did give me some of the angry bees sound I've heard about, but it wasn't really too loud (just not a sound most of us are used to our cars giving us yet). I ran the entire trip on HV to be sure that I had enough charge that I always had enough electric assist for whatever I needed. I averaged 42mpg (real MPG figured off the trip odometer, gas pumped and a calculator, not the 5% or so optimistic trip computer) in the mountains and about 45mpg once I got out of the mountains and on flatter ground. Even on the highest passes (granted, these are East Coast not West Coast mountains) I never had any issues with power and I could easily and smoothly accelerate when needed while climbing the mountains. I was mostly on 70mph speed limit highways, so I was running 70-80mph (mostly in the 72-75mph range, but sometimes in the 75-80mph range). Aside from efficiency and power (which I was quite happy with), it is a very nice trip car. The smooth ride and comfortable seating position meant less fatigue on the road. Road noise is quite quiet once out of the mountains (and other than a sound most drivers aren't used to with the "angry bees" it was still relatively quiet there). It really was a pleasant drive. My only real complaint was the size of the gas tank. Running on HV mode (low to mid 40mpg efficiency) meant a lot of gas stops. Once I hit more rural areas where I didn't know how far I'd be between gas stops, I really wasn't comfortable going more than 200 miles before getting gas, and I always kept it below 250mi between getting gas, which meant a lot of stops. Still, if you are a bit older, have kids, or (like me) you have certain health problems, you will probably need to stop pretty often anyway. After a while I just started to get gas whenever my diabetes accelerated bladder told me I had to stop for the bathroom (regardless of the miles since my last tank) and make each stop really count.