I don't know exactly about how much it holds, but all over the world the price of gas has escalated, and will continue to do so for some time. Sorry I can't be of more help. I sympathize with you about the cost though.
Sounds like it. Gasoline expands in hot weather therefore you shouldn't be able to fit more fuel in the tank as you would in the winter. The engine doesn't actually hold fuel. 1.1 would indicate the amount of fuel it can burn in a certain amount of time.