A little more explanation.
The issue is that diesel acts as a lubricant for the fuel injection system. Pure gasoline will wash the lubricant away and cause extreme wear.
As long as there is enough diesel oil in the gas/diesel mixture to act as a lubricant you won't damage the car.
Of course, its better to be safe than sorry.
I doubt there was any damage to the rental car that started this discussion. 20% gas should have enough lubrication left.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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