Jeep Grand Cherokee Wrangler 91-99 4.0l L6 Manifold Header W/ Bolts Gaskets on 2040-parts.com

U.S. seeks 5 percent annual fuel-economy gains through 2016

The Obama administration today proposed gasoline mileage and greenhouse-gas pollution standards for new vehicles for model years 2012 to 2015, filling in the blanks for manufacturers en route to a 35.5 mpg national target in 2016. The Transportation Department and EPA proposal calls for fuel economy to increase by about 5 percent each year, starting from an average of 27.3 mpg for the 2011 model year, the agencies said in a statement. The average car buyer would save more than $3,000 in fuel costs over the life of a vehicle, the statement said.

Twin-turbo Ferrari 458 Italia takes on the Lamborghini LP-700-4 Aventador: Video

Exotic-car tuner Underground Racing from North Carolina prepared a Ferrari 458 Italia with a “bolt-on” twin-turbo system, boosting engine output to 700 hp. For comparison, the tuner matched the blown Ferrari against a Lamborghini LP-700-4 Aventador and its naturally aspirated 6.5-liter V12, rated at 700 hp. “We were interested to see how they stacked up against each other after seeing a twin-turbo Gallardo almost get beat by an Aventador,” Underground Racing president Kevin Howeth said.

One Lap of the Web: Porsche 959s, the Alfa Romeo 4C and the Mercedes-Benz A45 AMG vs. the BMW M135i

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- When initially produced to satisfy FIA homologation requirements in 1986, the Porsche 959 was the world's fastest street-legal production car.