I think it's normal. Though, I haven't been up to that elevation, my dad's Honda Ridgeline with a 250 HP naturally-aspirated V6 engine felt like 170 HP through the mountains in Colorado. We could barely hit 60 MPH, with the accelerator pedal mashed to the floorboard (Yes, 100% throttle most of the uphill drive).
"Why would I want to profess my feelings for some 3D girl?" - Tomoya Aki from the anime Saekano