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Audi fits its largest sedan with a familiar 2.0-liter, turbocharged 4-cylinder engine and then mates it to a 45-horsepower electric motor for a combined 245 system horsepower. A lithium-ion battery pack is stored in the rear. According to Audi, this efficient flagship will accelerate to 60 mph in about 7.5 seconds and reach a top speed of 146 mph. Best of all, the 5-passenger full-size luxury sedan earns the equivalent of nearly 38 mpg on the EPA cycle.