Here's a newsflash, guys: Those commercials that Shell has that gets all sciencey about the additives and cleansers aren't lying. They might not make the gas as high-tech as those vibrant demonstrastions suggest, but we've tested BP and Shell against gas like Speedway, and there was at least one or two MPG difference. Don't cheap out with the Super Duper Mega Gas. Put quality fuel into your car and expect a cleaner engine and better mileage.