Re: @LucreLout
@Joel1
Sorry about that Joel. You are obviously correct, and this is something I pointed out in a later post further down the stack discussing differences between petrol and diesel engines, having realised I should have been clearer here.
The reason I brought up sparks/petrol engines is that I am 100% convinced that an identical gaming of the system happens with petrol engines, and am looking forward to the shennanigans next year when I am shown to be right.