(Re-posted from Honda_Civic_Hybrid on yahoo)

Hi all,

Next month, I'll be driving my HCH from Colorado to Iowa. The trip will reach as high as 6 or 7 thousand feet, and go down to just about sea level.

Anyone recommend things I should do to prepare for the change, or what I should do after I'm at sea level?

With other vehicles, I leave my tire pressure the same until I get down in elevation. Once there, I wait for the tires to cool overnight, then pump them up as needed. When going up in elevation, I let a couple of psi out before the trip, and re-check at higher elevation.

As for octane. It's possible that I can fill up at 85-octane, and be at low elevation before that tank is finished. Should I consider filling up with 87 before the trip? Or just wait till I get there and check for knocking as I drive down?

Thanks,
jinno