garageman402
$100 Site Donor 2024
One thing I didn't see anyone address is octane adjustments for altitude. The Texas people on here should be familiar with that if you've been through hill country. We stopped at Phillips66 and Valero in NM and Texas advertising crazy low prices, but when I pulled in, the regular was 86 octane. Mid grade was 88 but 40c higher. Even the Shell had 86.I have read that at higher elevations in the Dakotas, 85 octane is offered. 86 may have worked until we got back down to sea level, but I wasn't taking any chances.