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Carbs are dirt cheap, and work well. No big secret. About the only way to police EFI would be a sealed unit the sanctioning body would provide that you can then program to your car. Otherwise the EFI could conceivably be used for traction control and who knows what else. It definitely will not be cheaper than carbs, count on it.
The biggest problem to me is the censorship. Just too much control.



Not only that, but you know the teams with lots of $$$ like Hendrick and Roush will have figured out ways to "massage" the system better than the teams with less monies. Look at how long Hendrick had a stranglehold after they adopted the COT until the other teams (finally) caught up.

Any major change means the teams with the most money will figure it out first and exploit it. It's the exact opposite of "cost savings to the competitors". The best R&D wins.