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Get a new Gen ScanGauge II.
It has read out in cost per mile / trip/ tank/ day etc. I tried it on the Vibe and found out that Premium cost about 1/3 cent per mile LESS than 87 (at current price levels). May/ May nt be worth while loss in MPG switching to lower octane .. .
Welcome to the site. I think you might be the first Saab here.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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