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Could it be that 10% weighs less per gallon than straight gas? If so the fuel sender float would have to displace more of it to float, thus making it sink lower in the tank thus giving a lower reading at the gauge.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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