Surging was really only the 04-06 models after that the ECU got a far bit of a change with the lamba probe in the exhaust etc. People still say they surge but its mainly them coming from 4clyinder bikes and saying the single is just not as smooth.

Not sure on the 2 into 1 exhuast but ive a set of 2into2 and the sound is very nice, similar to a motox bike but not just as quick revving or as harsh with the baffles in (baffles out its loud).

Best mpg ive got was 78 crusing at 65mph on motorway. But normally average around 60mpg on roads and depending on the off roading drops a fair bit over here in the UK as off roading is very stop start.

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Plough on