So a few weeks ago on the show a caller from Denver asked about using a lower fuel octane at altitude and the answer was there is no harm since the compression in the chamber is lower with the thinner air you can use a lower octane. So that got me to thinking if using a higher octane fuel than reco…

Fuel octane at high altitude

fitjeep June 23, 2009, 3:37pm 2

There is no down side to running with higher than necessary octane, other than wasting money.