yes you can do the math for every 15 gallons of gas you buy you get one gallon less (roughly) so lets see, you have a motor that uses premium for a reason, it has higer compression than most motors, running crappy gas, and worse cheap crappy regular will cause pinging, especially when you step on the gas uphill (it sounds like a horrible rattling sound,) when you put the wrong gas in, and hear that rattling sound, that is your engine self destructing, so you cant afford regular, if you use it, in short order you will destroy your engine. but hey, on the plus side, you can have a new engine put in that runs on regular.
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