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A digital oven thermometer can give you a temp reading. If the temp gets too hot, accelerating performance turns crappy, and spark retards. Fuel economy actually drops if it gets too hot (it was terrible at 195f). My current version has a flapper valve to control hot or cold airflow to keep it from getting too hot.
Insulating the whole thing and then covering/sealing it up with duct tape solved the heat loss problem for me.
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