Quote:
Originally Posted by Otter74
I grew up with a 10-cent spread between each grade. The current range does seem a moneymaker to some degree.
'Premium fuel recommended' means it will run fine on regular, but was tuned for premium and will make insignificantly less power on regular.
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For modern cars, yes. They can watch for knock and pull ignition advance when they see it. It means less power and efficiency, though, and isn't good for the engine itself. I think mine says it can run on regular in a pinch but it's advised to refill with premium ASAP, '17 Alfa Romeo Giulia.