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I don't know about the most efficient. Looking at the first result of a gasoline powered generator at Home Depot -- the DEWALT 7,000-Watt Gasoline Powered Elect
by VanillaCafe 10y ago
I don't know about the most efficient. Looking at the first result of a gasoline powered generator at Home Depot -- the DEWALT 7,000-Watt Gasoline Powered Electric Start Portable Generator -- the description states, "The 7.5 Gal. steel fuel tank provides 11 hours of runtime at 50% load."
That's 11 hours at 3500W for 7.5gal == 5.1 kWh/gal.
1.8 gallons in that generator gives about 9.2 kWh. Or, 11.7 gallons to get 60 kWh.
Some other quick searching says gasoline has 33.4 kWH/gal and that typical gasoline engines in cars are around 25% and the best peak at maybe 35%, giving between 8.4 kWh/gal and 11.7 kWh/gal. Which is between 5 to 7 gallons for 60 kWh.