Print 48 comment(s) - last by JediJeb.. on Jun 6 at 6:09 PM

Tesla Model S Signature starts at $105k

As if successfully completing the first commercial mission to the International Space Station and back wasn't enough, Elon Musk is also finding quite a bit of success with his electric venture: Tesla Motors.
Inside Line is reporting today that the Model S Signature Performance, the top-of-the-line trim level, is already sold out and Tesla Motors is no longer accepting pre-orders. Customers now wanting to purchase the Model S Signature Performance will have to be put on a waiting list.
Interestingly, the standard model is still available for pre-order and has a base price of "only" $57,400 before a $7,500 federal tax credit (President Obama wants to see that federal tax credit increased to $10,000). The Signature Performance, however, has a base price of $105,400.
The standard Model S comes with a 40 kWh lithium-ion battery pack (8-year, 100,000-mile warranty), can hit 60 mph in 6.5 seconds and has a top speed of 110 mph. Range is listed at 160 miles.

 Model S Signature at the Tesla Fashion Island Signature Weekend [Image Source: Tesla Motors]
The Signature Performance ups the ante with an 85 kWh lithium-ion battery pack (8-year, unlimited miles warranty). As its name implies, performance improves greatly with 0-60 times dropping to 4.4 seconds while the top speed increases to 130 mph. The maximum driving range of the Signature Performance is listed at 300 miles.
The first deliveries of the Model S Signature Performance will begin on June 22. Those who have ponied up for the standard Model S will receive their vehicles later this fall. Those who haven't already pre-ordered the standard Model S still have time to get in line; Tesla is still accepting $5,000 deposits for the vehicle.

Source: Inside Line

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RE: Efficiency Sweet Spot?
By WalksTheWalk on 6/4/2012 5:55:32 PM , Rating: 2
I was merely taking my anecdotal evidence with the vehicles I've driven (mix of V6, I6 and I4 engines) where a reasonable cruising speed of about 60mph is close to the most efficient based on the computer's calculations of mpg. I've made trips at 55/60/70/75mph and generally see that about 60mph is the best. The engine's RPM is somewhere around 2,300-2,500rpm at 60mph in the newer vehicles and they all have am overdrive gear.

For older vehicles back in the 90's, early 00's it was about 50mph so it seems like manufactures are cluing into the fact that people drive faster than 50-55mph and better efficiency should be geared towards 60mph.

RE: Efficiency Sweet Spot?
By Jedi2155 on 6/4/2012 6:14:30 PM , Rating: 2
My general rule of thumb for maximum efficiency in a ICE is 40/50 MPH and up is worse. For EV's its 20 MPH and up is worse. Variations differ depending on auxiliary loads and size of the engine with idea that the larger the engine generally the faster you should be traveling to make up for other losses. Please correct me if this assumption is a poor one.

RE: Efficiency Sweet Spot?
By JZavala on 6/4/2012 6:50:26 PM , Rating: 1
not to be mean or anything, but you just showed your age. the reason cars from the early 90's were better at 50mph was because highway speed limits were lower. being in the ~55mph range. and before that, even slower.

RE: Efficiency Sweet Spot?
By Jaybus on 6/6/2012 2:31:47 PM , Rating: 2
Now you show your age. :) They were lowered to 55 by the 1974 Emergency Highway Energy Conservation Act as a response to the 1973 OPEC oil embargo. Before that federal law, it had always been up to the states, and was 70 in most states. The federal law was repealed in 1995 and speed limits are again set by each state.

RE: Efficiency Sweet Spot?
By Mint on 6/5/2012 2:37:14 AM , Rating: 3
Manufacturers can't change the laws of physics. The fact is that you need more mechanical energy per mile at 60mph than at 50mph or 40mph. If a car is most efficient at 55-60mph, then it must waste a lot more energy at lower speeds than its competitors due to poor gearing, high friction, big engine, etc.

An efficient car will always get better mileage cruising at 45mph than 60mph.

RE: Efficiency Sweet Spot?
By JediJeb on 6/6/2012 5:21:50 PM , Rating: 2
Best efficiency for the engine is normally near its peak torque rpm. Above that you may have more power, but are using more fuel proportionally, and below you are getting less power but using more fuel proportionally. If the engine would produce power in a linear ratio to the amount of fuel burned then it would be a simple matter of getting more efficiency the slower you drive(in a vacuum on a frictionless surface as in all the college physics assumptions lol). Since almost no drive is over completely flat roads, then you reach a point to where driving slower costs you too much fuel when you have to travel up a hill, since if you were moving faster you could cruise up the hill letting your momentum carry you over.

My example in another post where I had a truck that got terrible mileage at 40mph versus what it got as 60mph is a good example of how real world results don't match up with theoretical assumptions.

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