Fuel economy testing is a game of inches. Unless you're comparing a classic-style tractor and a bare-bones dry van to the latest aero tractor and slick, aero-festooned trailer, you're not going to see ...

Your car's engine needs a very specific diet of air and fuel to do its job, and it's the fuel pressure regulator's (FPR) job to feed it the right amount. The gadget is relatively tiny and can fit in ...

High-pressure common rail fuel (HPCR) systems are standard on nearly every diesel engine today, from heavy equipment to over-the-road trucks, light-duty trucks, large generators and more. HPCR fuel ...