MilesAhead what do you say now? 
-kalos
On the gas ID thing it could be WiFi for that matter. Same with info from the pump as to amount,price,octane rating etc.. The computer in the vehicle could calculate the net octane rating from all the mixes of gas. Much simpler than actually analyzing it. Of course things would have to be standardized to avoid being locked in to one gasoline company etc..
On the police cars when they are tuned up they are set to the spec in the book. What's in the computer is done at the factory. Most likely some pencil pusher cost accountant comes up with the brilliant idea of buying the cheap gas. Thus the timing under load is way too advanced. The guy doing the tune-up can see if the air filter is clogged pretty easily. Getting gas with the octance available when the car was manufactured is another matter if the cop car has a big V8.
Before electronic ignition and after they started raising the gas prices if I knew the customer was burning regular in a high compression engine I used to performance time it via test drive. It would at least not react like a bucking bronco. But it's not worth the effort if you get some dick who wants the settings "by the book" as you can never get him to admit the gasoline available when he bought the car is not for sale now. Thus making the initial timing wrong. Especially if the cheap bastard is buying regular on top of it.
