It doesn't really matter unless you're willing to try and fix this systemic problem in earnest. If you believe the cause is ethanol than you're probably willing to accept having to continually change out injectors unless you go with Greg's NISMO recommendation -- which no doubt will fix it at great expense. The running explanation that ethanol or positive voltage corrode the injectors to the point where the resistance increases doesn't make sense. How is that even possible when the fuel doesn't come in contact with any electrical part? Continuously subjecting to ethanol fuel burns a hole through the injector until the electrical connection gets severed? Sometimes in less than 10K miles but other times not for 100K?? The best explanation of the failure mode was given by DVDBurn and is linked in my original post. If you have any doubt you'll find it. Otherwise blind faith and replacing injectors all the time is ok too.
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