i read somewhere it was 6% gain in speed with road bike gearing if you were doing 100RPM...
I'm kinda in same boat I have the road bike but want to do some work (wheels sets) to it before i ride it too much and my speeds have been about 15mph on the mountain for numerous 8 mile rides and a 21 miler and cant wait to get the extra boost to distance and time...
maybe its the smoking?
