Our team of expert reviewers spent more than 80 hours researching, comparing and evaluating the best portable generators on the market today. At the end of our analysis, we chose the Honda EM6500S as the best model overall. This is due to its excellent fuel efficiency, long running time, fully array of outlets and outstanding safety features. It also has the longest warranty period of all the portable generators we reviewed. It is the heaviest generator we evaluated, but that’s the tradeoff for the raw power this machine produces.