So I am a bean counter and I am all for statistics and numbers. Having a spare time is DUMB (except for a jeep on a Rubicon trail run). To be clear, I am not saying you're dumb, rather... It's the concept of hauling a 30 lbs wight (yes! Even on your "road trips". It's right up ther with ppl insisting on changing their own tires (what the Hell for? Call AAA and dont break a sweat nor get your hands dirty).
Why chuck along the weight and taking up the space on a road trip where the probability of getting a flat on a good conditioned.tires is remote?!
Now I can agree with you if you are somewhere that is 100 miles away from civilization and tire shop. But tell me when was the last time you were at a place like that in a can in US???!!!
Go ahead... Since you're just waiting for your car, I thought I'd keep you busy with debates,
Cheers
beewang