irregularities

OK, so this has been covered plenty of times before, but just wanted to post my experience after receiving this years renewal premium from Hastings Direct. Last year, I paid £282 fully comp, missus included with protected NCB on the E55. So I knew that IPT had increased on 1st June, so...

I thought that by now with all safeguards put into cars that clocking was a maybe a thing of the past. AM57OSW. put into the DVLA MOT check and some weird readings come out. this is the third car with irregular readings.

Why does my average mpg (since reset) creep up when my average mpg (since start) is much lower, surely it should reduce? It's baffling me