O.K. , this is a really good thread ,I have a SERT in my bike and was wanting to better understand this piece of hardware-software which ever you want to call it . I have noticed the performance differences compared to stock bikes,and have noticed the difference in engine temps compared to my old sportster, which was stock. I have an oil temp gauge in the oil cap but it currently is out of commision,dead battery I'm assuming,it's the digital unit offered by hd in the catalogue. I am averaging 43 mpg on the last 3 tanks of fuel, with average speeds of 60-65 mph. Is it common to see this tuner needing to be updated to maintain tune?