I had a propane generator and gave it away and replaced it with a 4-cylinder diesel Lister Petter 18KW generator. It uses about 3/4 gallon at 100% capacity, which it never gets to. Most of the time it is running at 1800 RPM at 50% service. It is hooked to an automatic transfer switch and has a 30-gallon tank mounted under the unit. We use propane for cooking, and a hot water boiler, and nothing more. I hate dealing with the propane dealer because they are always looking for ways to add to the bill. Last year they added an environmental compliance fee of $14 to each delivery. I told them that they had a choice to either remove it or take their tanks out. They removed the fee. It is very distasteful to have to constantly monitor your suppliers for unethical billing. A couple of years ago they tried to add a sales tax to the bill, but the state doesn't tax propane used for domestic use. If I wasn't so old, I would switch to an all-electric home and go with geothermal heating and cooling. Not enough years left to make it worthwhile now.