If you've ever fueled up in Colorado, you might have noticed something unusual about the gas octane ratings at the pump – specifically, the availability of 85-octane gasoline. This lower octane fuel ...

Gasoline is a mystery to most hot rodders. For the most part, we just fill up the tank and forget about the fuel. The most difficult question is whether to step up from 89 to 92 octane. As you might ...

There's a lot to know about vehicle ownership, from maintenance intervals and tire choice to oil type and tire pressure, but too often, people gloss over the fuel they're putting into their vehicles, ...

The answer is yes: You can mix 87 and 91 octane gasoline without blowing your engine to hell. With that out of the way, let's discuss what mixing different octane fuels does to your engine in terms of ...

Ethanol has less energy than gasoline, but it can make so much more horsepower! Ethanol contains less energy than gasoline, ...

We have to separate the chemical "octane" from a fuel's "octane rating" since they can be two different things. Think about it this way. If you learned your shapes in kindergarten, you should easily ...

Premium doesn’t add power in cars built for regular. Follow the label and prefer regular gas for cleaner engines and steadier performance ...

Everyone from Nostradamus to the Department of Energy predicts that internal combustion engines will provide primary propulsion for the majority of the vehicle fleet for a few more decades. But it's ...