well heres the verdict. I got 18 mpg on my last tank which is absolutely horrible considering I usually get from 25-28 mpg mixed driving. I attribute it to two factors, the fuel additive and wind. The last week has been extremely windy (40+ mph at times) and I was doing some driving in it. I filled up again and it seems that my mpg is back to normal so I am happy - case closed for now!
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2000 Chevrolet Malibu LS
2000 Oldsmobile Alero GL (sold)
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