You have a modern fuel injected engine, the only thing you would get would be some greater air density from cooling it.

Air/fuel ratio is controlled, reguardless of atmospheric temperature, pressure, or fuel density, by the oxygen sensor and mass air flow sensor.

You don't have fuel mixture problems, but you have a HUGE decrease in performance. My old Audi Fox (K-Jetronic fuel injection) ran fine at high altitude, but I had to run in 3rd gear most of the way from Vale to the top of the Eisenhower tunnel -- no horsepower. Ran as fast as I wanted in 3rd, but when I shifted to fourth just faded away. No smoke.

The difference in air pressure between a cold day and a hot day will be noticable. Turbocharged cars only suffer from serious turbo lag, performance is normal once the turbo comes up.

There is no cure, short of moving to a lower altitude.

Peter

__________________
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!