Cars that say premium gas only, what happens if you don't use premium gas?

[asemaster]

@common_sense_answer

Lane change, auto braking, sensors in the windshield… Many folks only see a “$” when those puppies start lighting up because of all that crap that some politicians thought were needed on cars.

On the other hand many people see those items and see features and benefits that make their driving experience more efficient and enjoyable. Not everyone wants to drive a base-model stripped down car.