I have a '94 Wrangler ( 4-cyl, 2.5L, OBD-I, 130,000 miles ), and I am going to be driving it in Mexico next month at *extremely* high altitude (at least 13,000 feet, and maybe up to 15,000 feet).
Is there anything that I can or should do ahead of time to prepare the engine for high-altitude driving (other than the obvious stuff, like a clean air filter)? FWIW, I have also heard that Mexican gasoline is several points lower in octane rating than USA gasoline.
TIA, john w. ( jwallacq AT hotmail DOT com )