I just put it down to poor service really. The BMW dealer up the road had no problems collecting my MINI from my place of work and the difference in mileage was minimal.
The last time my car was in to be repaired I was to keep the loan car for a few days so I put in what fuel I thought I would use in that time. They called a day later saying my car was ready and I could pick it up. So I returned the loan car with just under half a tank of diesel in as there was no way I could use it in that time.
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