Direct injection optimizes combustion efficiency and also permits the use of very high compression ratios for high power output without engine knock, because the high-pressure fuel charge reduces internal cylinder temperatures. The result is a 20 percent increase in efficiency compared to an otherwise similar engine without direct fuel injection. Turbocharging, meanwhile, boosts low-end torque and also provides on-demand power for merging and passing at higher speeds. In the new Lincoln MKS sedan, the 3.5 liter Ecoboost engine returns 17 mpg in city driving and 25 on the highway - while producing 355 horsepower. In contrast, Ford's workhorse 4.6 liter V-8 (used in everything from Mustangs to Explorer SUVs) produces 40 less peak horsepower (315 in the Mustang GT) while managing only 16 miles per gallon in city driving and 24 miles per gallon on the highway.
Ford plans to offer its line of Ecoboost engines in fully 90 percent of its vehicles by model year 2013.