I cannot say that I bought the CR-Z for the fuel economy. It is better than my current car, as demonstrated by Xist. I should be able to get 55 MPG with basic techniques such as DWL, DFCO and neutral coasting, not to mention the Stop/Start function. Looking for a mix of fun and frugality.
Concerning the engine kill switch, I think it will be hard to implement it without potentially affecting/voiding the warranty. Unless there is a non-intrusive method to do it.
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