How much gas does your genny use? And a charging question

I use my Honda EU1000i late evening to bed time. 5 hours on about a quart of gas or less. I start the Honda when my house batteries get to 12.5 volts. I set the charge rate at 5amps on my Inverter/Charger. This allows the TV, 2 computers, the ice maker, and what lights that are needed to run. Fridge is on gas. By bedtime, the batteries are in the float stage. 13.2 volts.