What's the difference between a parallel, series, and plug-in hybrid, and why do you need to know? Everything about the technology and the vehicles for the shopper or the merely curious.

Back in 2004, several automakers got together to create a more pure form of gasoline to meet strict standards set by the U.S. Environmental Protection Agency (EPA), now known as Top Tier gasoline.

There are many tips about how to maximize a tank of gas and save the most money. Many of them are unproven, or well-intentioned but lacking details. Adrienne Woodland of the AAA of Michigan said there ...