What is the difference between the Edge Insight CTS Diesel (Part #: 85200) and the Edge Insight CTS (Part #: 83830) The Edge Insight CTS Diesel goes for about another $200 than the other one. Is it ok to run the one that isn't labeled Diesel? I tried to compare them on their web site, not much info really. Anybody with and info or specs, please let me know so I know which one to get. Thanks!