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I have a voltage meter on my radar detector, the voltage hunts all over the place anyway depending on the electronics. It'll dip like crazy if you're playing music, rolling down the window, if the fan cycles, AC turns on or off... probably more if your battery can't provide the instant power the car requires and it leans on the alternator more often. That may be the side effect of using a lightweight battery.
If you use a stock battery, it takes a little while for a standard battery to provide power on demand. AGM batteries like optima and similar can provide it a little faster. I have absolutely no idea how a motorcycle battery would work for that purpose but it's entirely possible you've overtaxed the alternator.
Gas quality was my problem briefly, I just went back to Costco but I'll probably throw a tank of shell in there every so often. FYI, I learned the detergent they use for top-tier status is Lubrizol.
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