Not necessarily.
The chemical interactions between medium-chain hydrocarbons and alcohols is not very well understood by the average Joe. If you were to perform an A-B-C-C-B-A test on a lawnmower with a simple carburetor controlled engine, with E10, straight gas, and M10 (10% methanol), and run the engine until it quit, with time of run being indicative of efficiency (longer time being more efficient) you would likely find out the difference in the fuels shows what so much anecdotal evidence is showing.
If they were smart, they would go back straight gas as it doesn't form an Azeotrope with water (
wiki it, not going to explain it
again.)
While we're on it...
Average Energy Content of Various Fuels
1 kilowatt-hour of electricity ... 3,413 Btu
1 cubic foot of natural gas ... 1,008 to 1,034 Btu
1 therm of natural gas ... 100,000 Btu
1 gallon of liquefied petroleum gas(LPG) ... 95,475 Btu
1 gallon of crude oil ... 138,095 Btu
1 barrel of crude oil ... 5,800,000 Btu
1 gallon of kerosene or light distillate oil ... 135,000 Btu
1 gallon middle distillate or diesel fuel oil ... 138,690 Btu
1 gallon residential fuel oil ... 149,690 Btu
1 gallon of gasoline ... 125,000 Btu
1 gallon of ethanol ... 84,400 Btu
1 gallon of methanol ... 62,800 Btu
1 gallon gasohol
(10% ethanol, 90% gasoline) ... 120,900 Btu
1 pound of coal ... 8,100-13,000 Btu
1 ton of coal ... 16,200,00-26,000,000 Btu
1 ton of coke ... 26,000,000 Btu
.
1 ton of wood ... 9,000,00-17,000,000 Btu
1 standard cord of wood ... 18,000,000-24,000,000 Btu
1 face cord of wood ... 6,000,000-8,000,000 Btu
.
1 pound low pressure steam
(recoverable heat) ... 1,000 Btu
So we need to be adding Residential Fuel Oil to our gas tank!
