Lol - I wonder how much of that is due to excessive oil consumption from the rotary engineMazda was sued by over rating the horsepower in their RX7. Everyone got free oil changes for life or a cash settlement.
PS Back on topic - I noticed a perhaps 5-10% improvement in mpg after the first 10k miles service. I'm consistently 52-54mpg (UK) in town conditions rather than 47-49mpg (UK) in town conditions. Of course that could be due to less traffic on the roads cos school's out and summer mpg vs winter mpg