Is It Ok To Mix 87 And 89 Gas. Most cars will specify regular (87 octane) fuel, and will run best on it. Gas with enthanol is just plain gas with ethanol added.
On some cars there'd be a mpg penalty going the other way (if ignition timing retarded automatically to eliminate knock). Yes, drivers can mix the two types of fuel. Modern cars and compensate for the wrong gas.
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Nearly every gas station in america will have some form of range from 87 to 93. The combined gas types will result in an octane level somewhere in the middle — something the vehicle “will survive,” according to the drive. Mixing the grades to get 91 or so shouldn't hurt, but it probably isn't saving you much money. Using a higher octane than necessary if you opt.