I haven't read all the post either but what i would do is go get $10.00 of gas in a 5 gallon can, and when she asked me for $10.00 of gas I'd give her the 3 gallons of gas, then I could see if she really needed the gas or just wanted the $10.00 foir something else. Then if she took the gas I would refill the can to 1 gallon only and when she asked me for $10.00 of gas again, I would give her the gallon of gas and tell her the price at my Gas station just went up to $10.00 a gallon., then refill it to 1/2 gallon and tell her gas at MY gas station is now $10.00 a half gallon and just keep raising the price till she gets the pix.