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Regular or Premium

Posted: Fri Aug 04, 2017 10:49 pm
by Oddball
I have read somewhere - perhaps this forum, although I can't refind it - that someone suggested his XJ600 runs "much better" on premium gas. He even said it got slightly better mileage. Can anyone second those claims? I've always run regular in mine and it seems to work dandy. But of course we all want a little more oomph/smoothness/mileage - especially if it's as easy as paying a few more cents for a tankful of premium.