I am having a tough time rationalizing the bigger battery option (but may have to take it, due to my reservation estimated smaller pack delivery date will likely take me past getting the full US $7500 tax credit) .
Assuming published eMPG figures are accurate:
220 mile pack -> 198 mile max real world road trip range between superchargers (100% SOC to 10% SOC is about as mean as I like to be to my packs, for daily commuting I use 80% SOC to 20% SOC)
310 mile pack -> 279 mile max real world road trip range between superchargers (90% SOC to 10% SOC)
That's a whopping $9K for 81 miles of range (and that gap closes even more assuming equivalent battery pack degradation rate over time).
So this morning I headed over to evtripping.com, and decided to see about how the packs would differ on a real world annual US road trip I make, from LA to Austin:
220 mile pack -> 15 Supercharger stops -> 1798 miles total trip length -> 28h05m total trip time (using evtripping Model 3 60 data)
310 mile pack -> 8 Supercharger stops -> 1569 miles total trip length -> 23h52m total trip time (no Model 3 85+/- data available, so configured a Tesla P100D model at 86% efficiency (a hint that the Model 3 is significantly more efficient than the S), which models out as 311 miles range at 100% SOC, and the same average 272Wh/m as the Model 3 60 above)
A real eye opener. If you make lots or longer road trips, yes the bigger pack makes some time vs. money sense (but only then imo). Take your pick lots of short Supercharger stops and a lengthier trip, or half as many but lengthier Supercharger stops.
But $9k for 81 miles...really Tesla ????