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That's great! While I haven't had the opportunity to do a real road test on the 2008 RT in all day highway riding, I have done about 80 miles on my longest ride on it so far. That being in town and highway to average 44mph by the onboard computer. I would be excited to get mileage like 61mpg. Hopefully I'll get that chance soon.
That 61 mpg was in a situation where the maximum speed was about 60, few stops and general speeds between 40 and 60.However, you should be able to do at least a little better than your previous beemer.