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My twin 250's hit 50mph but you can count the dollars being burned. The ECO mode set in Medallion puts you about 24-28mph but you can be out all day with a great cruising range. Maxed out, plot your next refueling stop carefully or carry a spare tank.
By law they are all speed governed. But they will move. I posted this pic back in late 2015 (twin 250"s) after my break-in period. And at that fuel economy, the 55 gallons goes quick..