How long have you had it? Does it have the power it always had or is this new?
My v10 with about the same miles on it as your has a lot of power. I usually pull a 4000+ pound trailer. Not that many hills around here. When I hit one I have to kick it down, never have to manually downshift. I lose maybe 10 miles an hour. I bet there would be some hills that are challenging though especially with a trailer.
It's hard to tell if what you are describing is normal or not. Did the mechanic that did the tune up give the v10 a bill of health? Mine still runs like new.
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