Contrary to many people's claim, using slightly higher octane gas can result in better gas mileage. I've noticed it. The EPA tested it and found the same to be true. However, the improvement in gas mileage was often only 1 mpg, not enough to offset the higher cost of premium gas. Around here, there's 87, 89, and 92. 91 and 94 are available in
BMW explains using lower Octane gasoline. "Thomas Plucinsky, BMW Product and Technology Communications Manager told us all BMW engines are designed to run on 91 octane. All performance testing, including EPA emissions and fuel mileage, is done with 91 octane. However, though BMW is all about performance, their motors will run on 89 or 87 octane

A few BMW models do require premium unleaded gasoline with an octane rating between 91 – 93, but most can simply use regular unleaded gasoline without performance issues. According to the official BMW website, cars like the BMW M5 Sedan, M6 Convertible and Gran Coupe, X5 M, and X6 M should only be filled up with premium unleaded gasoline to

BMWs operate at higher compressions than everyday cars, and premium gasoline is called for. The higher the octane number, the more resistance to uncontrolled combustion. In a gasoline engined car, the air and fuel are squeezed together (compressed), and, as you know, squeezing stuff together generates heat.
For most regular commuters, they're probably breaking even. Technically speaking, premium gas is now optional over days past when knock was a big serious issue. However, premium gas is literally premium and by manufacturer requirements it is NOT optional on specified cars. More power, more efficiency, less wear.
Certain BMWs do need premium fuel. These are the most typical causes for a BMW to need premium, but this is by no means a complete list. In the event that your BMW fits one of the following descriptions, avoid using normal gasoline in it:
We tested higher octane fuel than manufacturers require on the Honda CR-V, BMW M5, Ford F-150, and Dodge Charger to see if it impacted acceleration or MPG. Premium gas tracked at $0.59 more
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    • do bmws need premium gas