For example, if your car is a 2018 Nissan Maxima, whose owner's manual recommends you use 91 octane, the manual also says it's okay to fill it up with 87 octane. Modern engines in cars like the ...

The nationwide average for 87 octane is $2.36. “If I put 85 octane in my cars, they just knock like crazy,” said Ted Kinsman, a corporate financial trainer from Crestone.

It starts with her saying, “Just stopped to get gas. My cousin goes, ‘I’ll pump for you,’ and then she goes, ‘Your gas pump says minimum octane rating 91.” ...

Most states have the option of choosing octane ratings of 87 (regular), 88–90 (midgrade) and 91–94 (premium). Oftentimes, the lowest rating lies at 87 and the highest at 93.

A. Acura recommends 91 octane fuel, and the key word is recommends, not requires. If the car runs normally, and you are happy with the performance and fuel economy with 87 octane gas, use it.