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My question: Is you friend actually using E0 fuel in Germany? A quick google says Germany switch from E5 to E10 as the standard blend in 2011.
Next question: How many tanks of base gas did the friend use. Fuel mileage varies from tank to tank so 1 or 2 tanks is not enough to tell anything unless he is running a dedicated fuel economy testing loop that he does everything the same.
No, he didn't hurt is car by running E10. VW made their cars E10 compatible in 1986.
I also really doubt the US army is shipping gasoline from the USA to Germany for private cars to use. The fuel sold on base is very likely local gas sold without Germany taxes.
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