Just wanted to reiterate Court's point.
Unless one has a separate bike lane and smooth traffic, it's pretty risky to ride at 28 or 30mph on any BIKE/EBIKE.
On Reddit, every other day I see some dude getting hit by a car or something. Not trying to induce fear but that's the reality (more here:
https://www.reddit.com/r/bicycling/) and also I hope you have a very nice helmet. (NSFW pictures:
http://imgur.com/a/GdR2W, and more info
https://www.reddit.com/r/bicycling/comments/21flmm/i_went_over_my_handle_bars_without_my_helmet_it/)
Taking Vern's case into consideration. If you travel at 30mph the whole way (13.5 miles), you'll reach the destination in 27 mins. If you travel at 25mph, you'll reach in 32 mins. So considering the traffic signs, you might save 4 mins but is it worth the extra risk??
Carbon has narrower tires and sometimes when you try to go over small curbs at that speed, the wheel doesn't have enough traction and slips. This happens even if one has 2.3 inch tires.
Having said that, safe commute by ebike is one of those truly delightful activities.
Great start Vern and I am sure you will pick up more stamina and muscle power to get back home in 45 mins which is very close to what it takes by car.
Also, many universities/companies offer some perks like free or 50% discount on registration/parking fees for your car if you are commuting by metro or bike. Our university provides 50% discounts on parking for anyone who plans to use EV cars or bikes (I save $200 right there); something worth checking out.