Highly suggest getting a dual fuel generator, which avoids having to keep gasoline (with degrading and volatility of fumes issues). Being able to run out of propane (although not generating the full power out of the generator) and gasoline (if needed) is a great way to go. Propane is a lot more stable and you can have storage of many different sizes. Remember when the electricity goes out (whether in winter or summer) the resultant long wait lines for buying gasoline vs. many gas stations, hardware, 7-elevens, etc. etc. sell propane bottles. If your house is heated by propane then you already have a source of energy there - just needing to have a line installed so that you can hook up your portable generator to it.
RIGHT NOW COSTCO has a sale through 7/15/18 ==> dual fuel generator for $550 after $100 discount. 9400 Starting Watts / 7500 Running Watts - Gas
8450 Starting Watts / 6750 Running Watts - LPG
RIGHT NOW COSTCO has a sale through 7/15/18 ==> dual fuel generator for $550 after $100 discount. 9400 Starting Watts / 7500 Running Watts - Gas
8450 Starting Watts / 6750 Running Watts - LPG