You're at 5000+ feet in a normal aspriated car. The colder it is, the denser the air, and the more power you get. At that altitude, you are WAY down on power, you will notice anything that increases it.

I'd bet you wouldn't notice this anywhere near as much at lower elevation.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!