Mr. Big:
Regarding "mileage," our '08 Standard stays north of 35mpg if we ride nice. If we don't behave, it drops to around 30 mpg. Reckon a Roadster would not be far from these numbers.
Triumph offers bags, wind screen, boards, etc for the Rocket.
No doubt the TBird is a nice bike, but there are few cruisers that can equal a copy of Triumph's mighty Rocket for fun. We know of nothing that can surpass it.
Ditto on the mileage to wetrudgeon. Playing "nice" gets more mileage but sure isn't as much fun. That said, if true "cruising" is your gig then the T-Bird may be the way to go. The Rocket although a "big girl" is surprisingly nimble. And Harley guys DO NOT have an exclusive on low end torque. Ride both and don't just go around the block. Good luck.
Mine gets around 30mpg ridden "nicely", it can get low 20's if thrashed. Fuel economy wasn't much of a concern when you decide to build a bike around a car engine. lol
Mr B
Check the ground clearance - the Rocket beats the T-bird hands (or feet) down. I went for the Roadster after trying a T-bird and that sold it for me. The T-bird decks the exhaust first and that's that, you run wide in a shower of sparks -or into the ditch.
the Roadster grinds the hero blobs down then the footrests fold up - so you're still on line and safe -= and with ABS on the Roadster to boot.
But if you're not going to go mental through some twisties now and again, maybe a Touring is what you should test ride. Totally effortless cruising anyway
Like och2pot, ground clearance was one of my deciding factors. Plus the R3R is a unique bike with some classic Triumph touches. I rode both and liked both. It was a tough decision but once it was made I was very happy I went with the Rocket.
I bought EdgeBrackets and I plan to bolt some Givi hard bags onto them.
I just took a short 500 mi. ride on my Roadster and got 40-41 on the interstate at 70-75 mph. Around town, about 33-35. Romping it often, I get about 28-30.