Motormouth: Which gas should I use?

Q: I bought a 2018 Ford Edge Sport new and have driven it for almost four years. The dealership said to use 87 octane gas so that’s what I’ve been using. My manual says anything from 87 to 91. Where I fill up, 88 octane is usually a little cheaper, although one day it was 40 cents less per gallon. Would there be any harm to switching to 88 gas after all this time of using 87? I’ve tried to look it up but I’m seeing either yes, I can, or no, don’t do it. Just trying to save a few dollars if I can. D.S., Glencoe, Minnesota A: Yes, you can. That 88-octane fuel is 15% ethanol and 85% gasoline. It …

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