I have some 30% Heli fuel from last season, will it still be ok to use this up comming season again? After the season, I threw the cap on it tight and stored it in a dark area. Now the temp may have fluctuated from hot to cold but it was tight. Will this fuel still be ok? Also, I have a fueling cap on the bottle I am currently using when I go fly and just put the metal tip into the hole when I am done, is this a no-no? Should I remove the fueling cap and replace it with a normal cap until the next time I fly? I also have some 10% Tower Hobbies fuel that I don't use anymore that is probably at least 4 years old that has been sealed pretty well but I have no need for, are there any constructive uses for fuel other than for engines or killing weeds? Thanks in advance...