Hi Craig and welcome - all 6' 4" of you. [Is there any such thing as a short Texan?]
I would say that, weather permitting, the M3W is perfectly practical as an everyday car, just like a bike would be, wearing the right clothing on the right days etc. The car will cruise motorway/highways comfortably at around an indicated 80mph, returns 30mpg [uk gallon] and has a 9 uk gallon tank.
Reliability is quite suspect, but we all know about that and have to accept it, so don't use it when you HAVE to arrive at your destination on time.
It will always put a grin on your face and a smile on everyone who sees it - quite remarkable!
As far as your height is concerned, it will be a squash, you will be driving with your left leg bent and I would suggest that the front of the seat squab is built up with wood, to facilitate this, very easy to do. The only way is to try one, do you have a dealer close by? Whilst the factory have made the pedal box move a little further away, I have discovered it is not as useful as it might be, but does help, every little does.
Do come on back with further questions, it's all good stuff.
