Yes, I know what a hybrid is and yes, I have ridden one. But the OP is also asking for a 3mph average speed increase, which you can't get by new tires and a new crank/cassette by itself.
Originally Posted by thirdin77
If you get aerobars, you should get fitted to them so that your torso, shoulder, elbow and neck angles are right when you're using them. A fitter can determine such a fit.
And this probably isn't true. Good aerobar position depends from person to person, but all 90 degree angles sounds fairly uncomfortable to me.