I thought I would update anyone that is interested.
See "XM-5000Li and XM-3500Li Comparison (My Experiences)" for previous experiences and modifications.
The temperature range I rode in was 35 to 85 degrees The lowerest temperature I rode in the XM-3500Li was 25 degrees
It seems that riding in temperatures over 80 degrees has a limit of around 25 miles or about 30 minutes. That's when the motor overheat sensor engages. It's around 125 degrees using a external thermometer.
I was able to average between 40 and 45 miles per charge with an average speed of 40 - 45 MPH.
Here are the options and replacements I made:
I installed a self powered voltmeter on 3/18/2009 at 200.5 miles
I replaced the ignition switch (under warranty) on 4/17/2009 at 536.1 miles
I replaced the circuit breaker due to it tripping occasionally (BLUE SEA CIRCUIT BREAKER CA1 100A WHITE 7250 from Marine Deal) on 9/24/2009 at 1969.2 miles
I started having (what I consider) issues with the batteries the beginning of November (2009) at around 2260 miles.
I charge the batteries completely (voltmeter reading 80 volts) and after going down hill for only one mile the battery gauge drops into the red zone and the red light light starts flashing. The self-powered voltmeter indicates 65 volts. I've started putting the charger under the seat so that I'll have it if it is needed, as I'm not confident that I can go very far.
Even with the 65 volt reading most of the time I found I still get about 30 to 35 miles per charge (this is on the identical commute as before the battery issue began). It still goes over 60 MPH, so the power is there, just not the distance. There is now 2501.6 miles on the odometer.
Overall I'm still pleased with the XM-5000Li. It is a major improvement over the XM-3500Li (I like the extra speed and distance)
I'm hoping there is a way to re-condition the batteries to get the 22 percent back (back to 40 - 45 miles per charge. Maybe the 22 percent will come back once it gets warmer.