One of my reciepts from my first SS1000 was for .1 gallon, I used a pump that didn't give a reciept, then went to another one and put just a splash in so I could get a valid reciept. I explained what happened and it was fine.
On the turnaround point of my recent BBG I couldn't get a reciept from the gas station with a location, I went down the block and ate a small burger at Wendy's and used that reciept as a backup to the fuel one. I just got the email that my ride was verified so i guess that was OK. For the record Wendy's and Mcdonald's almost always have very good reciepts.