Quote Originally Posted by Slow Motion
"Shell regular and Plus gasolines, which meet the "Top Tier" standard, also contain more than two times the amount of cleaning agents required by the EPA. Shell V-Power goes even further -- it has more than five times the minimum amount of cleaning agents required by government standards and twice the cleaning agents required by the "Top Tier" standard. While the "Top Tier" standard is designed to protect engines from the future build-up of carbon deposits, Shell V-Power is specifically formulated to actively clean your engine as you drive giving it the ability to clean-up deposits that have already built up on intake valves and fuel injectors."
Which explains why Shell is usually 15-20 cents more expensive than other places.