I think that Macrulsman is right because if no gas is being ignited then the engine would die. And if you are burnig a small amout of fuel at a 100 times a second(6000rpm) then thats a whole lot more fuel then 8.3 ignitions per second(500rpm). And this is just a guess but I bet the amount of fuel is exactly the same as when its ideling then when its tryning to get down to idle when you down shift.
**ding ding** good fight fellas back to your corners
