I'm not sure how big my tank is on my Maxim, I was looking through the manuals on the form and they say that the tank is something like 5 gallons? That can't be correct, I thought our tank was something close to 3ish gallons giving roughly 150 miles of range. I normally fill up around 100 miles, I don't want to push it and run out because I have no idea if my reserve even works.