strictly speaking, if the displacement is 30.5cc ( a common size engine) and if we place our CFM rating @ 18,000rpm, which is an achieveable speed, the motor would be consuming 9.68 CFM per minute. breaking that down further, .013029015 pounds of air per second. follow? assuming we are at a nice fat tune, running rich enough for "maximum power" our ratio would be about 4.87:1 running 20% nitro 80% methanol. so by weight, we'd need .0026753 pounds of fuel, and that fuel would produce 23 BTU. running gasoline, with the same volume of air, we'd need .00104 pounds of fuel (significantly less) but we'd only produce 19.24 BTU.... 17% increase just on thermal energy alone. these formulas do not take into account the heat exaporation rates of methanol, as this fuel would absorb more heat out of the incoming air charge, making it cooler, and therefore allowing an engine of similar size to consume more air, as a cooler charge has higher density, and therefore weight.