I don't think sitting for 5 weeks will be an issue at all. Mine sits all winter long as I top my tanks off, run with stabilizer, then top the tank off again. I'll bring 5 gallons of 93 for my ski.. Guess I'll get a second can as I will have two skis this time. But I seriously doubt that my GTX will need any additional fuel. That things runs all weekend on 15 gallons.
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