Premium gas can give some cars a boost, hyping performance and making sure the engine runs smoothly. But not every car can make good use of premium.

It's common knowledge that buying an ex-rental car can be a path to scoring a great deal on your next vehicle. That said, consider that rental cars frequently have more blemishes than normal, such as ...

Are you overpaying for premium gas or getting suboptimal performance out of your car because you're feeding it the wrong fuel? Gasoline is categorized by octane ratings at gas stations. Most drivers ...