content: The small 1.3 liter 232 horsepower two rotor engine in the 2011 Mazda RX-8 gets worse fuel economy (16 city / 23 highway) than the 6.2 liter 455 horsepower V8 engine used in the 2015 Corvette Stingray (17 city / 29 highway).  The V8 in the 2015 Corvette can also shut off half its cylinders automatically when not under load (e.g. during normal, day-to-day use) to save fuel, so they're technically only comparing a 1.3 liter engine to a 3.1 liter engine at that point. Even if not for that fact, 232 HP / 1.3 L = 178.46 HP/L, for the RX-8 as opposed to 455 HP / 6.2 L = 73.39 HP/L in the Corvette. The power claim holds up under the scrutiny of basic mathematics.