ORIGINAL: Maudib
But I disagree about tank size... It hink most would put a 20 oz tank with a 1.60 and get about 12 minutes... You could put in a 12 oz tank with the BME and get more than that... so take off weight in fuel is a half lb. more in glow fuel...
As long as we are nitpicking the ounces...the tanks are in fluid ounces which when figured with glow fuel (which is lighter than water) is less than 1/2 a pound.
The last time I saw a cost comparison it came out that you'd need two or three seasons of average flying to even out the costs.