Audi 3.0L TFSI supercharged V-6 333 hp (S5) + Smooth as 12-year-old Scotch - Some argue engine about as old = We got your back, Audi S5 3.0L turbodiesel V-6 240 hp (Audi A6 TDI) + Advanced compacted graphite iron block - 2 mpg behind BMW diesel in our tests = Hard keeping this one off list   BMW 2.0L N20 DI turbo I-4 245 hp (328i xDrive Sport Wagon) + Thanks for extra 5 hp - Can’t match diesel efficiency = Tough differentiating 2.0L turbos 2.0L N47 turbodiesel I-4 181 hp ...

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