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What went wrong? Nothing. But his record-keeping probably sucks. If he can't produce a record of every tank of gas, his claim that it "got" 8L/100km intially but somehow "gets" 11L/100km now is dubious.
Even then, it doesn't really tell us anything. If you look at my fuel log, the first summer I had the Prius I had several tanks in a row over 60mpg; since then, 60mpg tanks have been infrequent. The car didn't change; my driving did. That summer I had a 56 mile commute (one way) on a 55 mph highway, ideal conditions for good fuel economy. Now, my daily commute is less than 5 miles and longer trips are almost exclusively interstate at 65+ mph. My driving profile changed, and this had a profound effect on the fuel economy my car returned.
So, before we can diagnose anything we need to ascertain if his claim is legitimate in the first place. And we can't do that without a LOT more information.
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