A perennial competitor to Ford's Power Stroke V8 and Ram's Cummins turbo diesel inline six-cylinder engines, the 6.6-liter Duramax is one of the most popular diesel powertrains for heavy-duty trucks, ...

In the first installment of this two-part series ( “White-Glove Treatment - Duramax Power and MPG Upgrade"), we performed an experiment using Hypertech’s Max Energy 2.0 programmer on Chet Kokkeler’s ...

The marketing cliche to sell SUV buyers on small turbocharged four-cylinder engines is that they offer the power of a V-6 with the fuel economy ratings of a four-cylinder. But how about a real V-6 ...

With the introduction of the '07 GMT900 trucks, you can get a 2500HD or 3500HD with an all-new body and interior wrapped around a cleaner and more powerful version of the famous Duramax diesel or a ...

The GM L5P Duramax is a turbo-diesel engine produced by General Motors for use in full-size heavy-duty (HD) pickup trucks. Displacing 6.6 liters in a V-8 configuration, the L5P is part of a new ...

The GMC Sierra 2500 HD is the more powerfully equipped version of the Sierra 2500. Available only as a Crew Cab with a 6-foot-6-inch bed, the 2500HD hauls 3,293 pounds with two-wheel drive, 3,639 ...

The Ram 2500 is one of the most popular heavy-duty trucks on U.S. roads, and it's easy to see why. It's got a distinctive road presence, rugged capabilities, significant towing and payload capacities, ...

The next generation of new cars and trucks will need to meet a fleet average of 31.6 miles per gallon by 2015, the Bush administration proposed Tuesday, seeking more fuel-efficient vehicles in the ...