Originally Posted by dennis
Vegas to Barstow is 152 miles. There's no reason to watch your speed other than the Highway Patrol.
Barstow to your hometown is about 100 miles. Even if you were almost empty it would take no more than 40 minutes to get 160 miles of rated range added and drive as fast as you want the rest of the way. 3:20 driving and :40 charging is 20%. And you're not going to get 250 miles of range out of the Karma driving at 75–80 mph so you would need a gas stop which makes the difference even less. That amount of time is worth it to me to be electric all the time.
I know you like your Karma better than your Model S and that's fine. I just want to inform other forum members about the reality of road tripping in a Model S.
There is about a 2000 foot elevation change and a 4000 foot mountain pass that really eats the battery, I have actually done this trip in two Tesla's one of them being a Model S (not mine was a passenger). To get to Barstow it takes minimum about 50kwh of battery @ 370wh/mi. This is driving conservatively 65-70 mph, minimum use of AC etc. So let's say this takes about 2 hours of driving time and you are left with 60 miles or so of range.
You charge up for 50 mins to get ~150 miles or so and have 210 ideal miles as you depart the Barstow Supercharger. You arrive in Vegas with 20-40 miles of range.
I think this is a bad move, if you stop in Barstow it is imperative to do a full range charge or you will be roughing it significantly with all the grade changes/heat it really takes a toll on the range. They need to really put a Supercharger in Primm and it will make this trip a lot easier and less stressful.
In my humble opinion I would rather drive 80-90 and get to vegas in 3.2 hours vs 5 hours (4 hours driving + 1 hour charging)
Have you done this trip before? If so has your experience doing it been in line with the above scenario you listed? Just curious