Cheating at petrol bunks is very rampant in India. It is done at various levels,either through adulteration (mixing kerosene with petrol) or tampering with the quantity.
I just came across an incident today, when I went to fill in petrol for my bike in a Bharat Petroleum bunk on the koramangala inner ring road. I was forced to fill in at this unusual place as my bike was in almost dry condition and I missed out the usual place when I regularly fill-in.
The service guy at the bunk was acting very hastily. I was keeping a watch on the meter at the pump, then another guy distracted my attention. Before I could realize the service guy finished filling in and has reset the meter. By no way I could ensure that he filled in the correct quantity. I was suspicious that he would have cheated at the least 1/2 litre of petrol from me. To support my claim the bike went to reserve mode even before I could travel another 5 kms.