Not that bad in 6 mos, I parked my van for a year and a half and started up just fine with the 1.5 y/o gas and ran well after that - and the gas tank is no doub

Not that bad in 6 mos, I parked my van for a year and a half and started up just fine with the 1.5 y/o gas and ran well after that - and the gas tank is no doubt a worse environment than a small dedicated sealed tank designed for the purpose.