Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

For new CAFE rules, automakers place high-stakes tech bets

Game-changing 2015 fuel economy rules are forcing vehicle development teams to make high-stakes bets on expensive technologies--bets that will separate the winners from the also-rans. Not only do federal rules target a 2015 fleet average of 35.5 mpg, up from the current 27.5 mpg for cars and 23.1 mpg for light trucks; they force automakers to bet on different technology packages for each vehicle segment. Companies that do best at mixing technologies while keeping down costs will have an advantage when buyers wince at higher stickers.

Wired for Speed: Enthusiasts turn to parts sites for aftermarket punch at affordable prices

You can get anything--literally anything--on the Internet. And for enthusiasts, this means that rare part is just a little bit easier to find. Ebay Motors says its listings of parts has increased dramatically in the last year, with inventory reaching about 13.9 million parts.

Evolution of the 3: BMW begins sales of sixth-generation sedan

BMW staged the U.S. launch of the sixth generation of the stalwart 3-series at the Detroit auto show this week, which makes this as good a time as any to take a look back at the car that other sports sedans aspire to be. The small sedan hit the scene in 1975, just three years after the 5-series, as a successor to the BMW 1600, the 1600ti and the 2002.