The new ads for Shell claim that they’ve specially formulated their gas to give you better mileage. How would this work? And does it even?
WAG, detergents that unclogs fuel injectors.
Better summer/winter blends and detergents. You have to read the ‘versus…’ small print.
I think it says ‘…versus non-detergent gasolines…’
“Better than what” is the key question, as Philster touched upon. It doesn’t necessarily mean better than with other brands of gasoline, though I’m sure they wouldn’t object if you assumed that’s what it means.