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I use gas buddy. It saves up to .25/gal. Got 91 for 4.50/gal tonight.
Which is helpful because AZ only has 91, so I use 1/2 gal of xylene and 2 oz of MMT per 10 gal 91 to get to 93.
That adds .83/gal. ($5.33/gal for 93)
For the longest I was adding 1 gal of xylene per 10 and that ended up being an extra 1.30/gal. ($5.80/gal for 93)
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