$4.97 for 93 octane. Cost $73.03 and 14.667 gallons to fill the Mercedes. Thankfully it get 34 mpg.
I simply won't buy a car that requires premium gasoline.
My ex wife had a 1986 Crapstang, one of the still very neutered Ford Mustangs. She was absolutely convinced that it was some sort of super high performance speciality sports car and absolutely REQUIRED premium gasoline or the engine would explode.
I showed her the book -- premium not required.
I showed her various industry articles on how premium is a waste of money if your car doesn't require it.
Nope. Absolutely HAD to have premium, or death, destruction, and debasement.
I NEVER put premium in it. And she never knew the freaking difference.