1
vote
Is it best not to use Reg 85/86 petrol at an elevation in place of 87?
As a starting point, this is what I found in regards to 85 vs. 87 in Colorado:
http://www.denverpost.com/2006/10/16/some-knock-states-lower-octane-levels/
Research several years ago from the American ...
- 814
Only top scored, non community-wiki answers of a minimum length are eligible