Octane Number Rating gasoline by octane is like playing a "Bo Derek" numbers game on a scale of 0 to 100. They're calling it "R plus M over 2" (R + M/2), and that's the number they're posting on ...

If we use today's formula for octane, research octane number (RON) plus motor octane number (MON) divided by 2, then the earliest racing gas had an octane rating of 89.

Most of the world classifies gasoline using only a research octane number (RON), but in the U.S. we use an anti-knock index (AKI). This averages the research and motor octane numbers—(RON+MON)/2.

In the U.S., regular unleaded gasoline usually has an octane rating of 87, with some pumps at higher altitudes also dispensing 85 octane fuel. Then there is mid-grade gasoline with octane ratings ...

Every vehicle has a recommended octane number for fuel. Most cars on the road fill up with 87-octane unleaded, but some vehicles recommend, or even require, 91- or 93-octane gas.

When you go to a gas station, you are presented with several types of fuel, each labeled according to an octane number. While most cars can do with regular gas (generally 87 octane), ...

When I pulled the F-150 into a suburban gas station with the tank near empty, the options were 87 octane at $4.399, 89 octane at $4.799 and 93 octane at $5.199.

This work studies the influence of changing fuel octane rating on two modern production gasoline vehicles, one with a naturally aspirated, port injected engine and the other with a turbocharged, ...