Three portable generators (PRO6.4, PRO6.4E, and PRO9.0E) are capable of running on gasoline, propane, and natural gas. The Kohler generators join the PRO9.0 in an expanding lineup of generators that ...

Bottom Line: This portable tri-fuel generator lasts a long time and has a maximum power output of 14,500 watts. Pros: It boasts a heavy-duty 550cc 4-Stroke OHV Westinghouse engine. It can run for up ...