I use only Top Tier regular 87 octane gasoline (typically Shell , Chevron , 76) ... What may I find with respect Top Tier additives vs. their premium high-octane gasolines ? *The Top Tier high octane gasolines have fancy marketing terms (Shell V- Power Nitrogen+ , etc. ) while the regular and mid-grade Top Tier gasolines are just sort of there alongside the high octane versions with little fanfare .