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Very poor idea, IMO. Just because you won't be doing any high RPM, spirited driving, these are still high compression, modern performance motors. The knock control in the DME will retard ignition timing to compensate for the lower octane fuel, and should save you from motor damage. However, you will have reduced the performance of the motor for a good bit of time, even after you have re-fueled with higher octane fuel until the DME starts to introduce more spark advance once it hasn't had any knock from the lower octane fuel. Hypothetically, a DME reset should start the clock over and force the engine to "re-learn" how to run on the proper fuel.
At the end of the day, how much are you going to save? Lets say you average 20MPG over 2000 miles, you're going to burn 100 gallons of fuel. Say you save $.25 per gallon, you just saved $25. If you average 25MPG (more likely in a highway cruise in your car), the savings are even less.
To me the risk is nowhere near savings that small. The motor was designed to burn Premium Unleaded, and thats all I'd put into it.
Patrick
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