I got a "check fuel cap" message and my avg.mpg, range, and fuel gauge went screwy.
There was no correlation between mileage, avg mpg and range of miles. I was getting readings of svg mpg of 30+ and range of over 450 miles. The fuel gauge would read half full and I put 7-8 gallons in the tank. The odometer still shows true mileage. I the EVAP and sensors tested at a dealer, no error messages were generated.
Also happened to my 2013 CRV. Answer I found was either you have tightened the cap too much (beyond a couple of clicks) or need to replace it. It takes awhile for the message to clear up once you readjust the cap.
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