By Nick Aziz
Saturday, Apr 25th, 2009 @ 4:43 pm

To coincide with the upcoming sales launch of its new A4 2.0 TDI e, Audi has released fuel efficiency numbers for the new midsize sedan. The has received a fuel economy rating of 51 miles per U.S. gallon. But if it’s U.S. availability you’re hoping for, don’t hold your breath. Audi has no plans to offer the TDI e model stateside.

This ‘e’ model develops an output of 136 horsepower and can reach 62 mph in in 9.5 seconds. It tops out at 134 mph and will sell for 30,800 euros. According to Audi , it’s the most fuel efficient standard-size sedan in the world.

The TDI e features a 6-speed manual transmission with a final-drive ratio five percent higher than the regular A4, enabling a reduction in engine speed in each of the six gears. The engine-management system has also been modified for maximum efficiency, Audi says. Fuel-saving low-rolling-resistance tires also improve overall mileage.

Standard equipment also includes a braking energy recovery system. Aided by intelligent alternator regulation, this system converts surplus kinetic energy to electrical energy during a vehicle’s braking phases. This electrical energy is temporarily stored in the electrical system’s battery. When the vehicle resumes acceleration, the battery supplies this stored energy to the vehicle’s network — reducing the load on the alternator and thus saving fuel.

An on-board computer with efficiency program is also part of the standard-equipment package. The on-board computer displays all fuel-efficiency data on the center screen. A series of recommendations enable drivers to conserve fuel to the tune of 30 percent — simply by modifying their particular driving habits.

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