Here's when drivers can fill up with regular gas instead of premium, and whether using premium provides any benefits.

Fuel comes in different grades based on octane level at gas stations. Only some performance engines require Premium fuel for the best power output, fuel efficiency, and engine function. Are you ...

Fuel comes in different grades based on octane level at gas stations. Only some performance engines require Premium fuel for the best power output, fuel efficiency, and engine function. Are you ...

I have a 2016 Toyota Avalon. The manual says that I should use 89-octane gasoline. I like to buy gas at my local Costco store, where the price is always lower than at the neighboring gas stations.

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octane fuel contains up to 15 percent ethanol, whereas 89 octane contains only around 10 percent. 88 octane is typically ...

Q. My 1998 Lexus ES 300 is losing small amounts of anti-freeze from the overflow container. I suspect it may be a head gasket leak since there are no obvious signs of leakage other than the loss of ...

I recently replaced my wife's 2012 Mercedes-Benz E350 4Matic wagon with a 2016 Volvo V60 Drive-E, a station wagon that impressed me when this magazine had a similar Four Seasons test car in its fleet ...