> 1.  The Electric motor in general is nearly 90%
> efficient.  The gasoline engine is 30%
and the engine that generates the electricty? 40% - 60% at best (in a
combined power/heat setup, but they're rare). Then the *best* chargers are
around 85% efficient; say 45% overall *at best*.

> 2.  The Tesla uses no gasoline,
The gasoline (or equivalent) is used by the power station

> just electric and batteries.  When you charge batteries,
> they don't get heavier.
True - they're just *very* heavy to start with

> When you fill up a car, it gets heavier.
True - around 100lbs for a full tank?

> 3.  Battery technology has gotten much better lately.
For automotive use you are pretty much restricted to lead/ acid batteries -
I don't beleive that technology has improved much in the last 100 years!

> 4.  The Tesla is using "secret" technology that
> they're either trying to patent or have patented.  A
> more efficient use of power.
Ah! - the old 'secret technology' argument. Like perpetual motion,
frictionless bearings, the secret of the pyramids, the power of crystals,
something for nothing...

Andrew Davies  MBCS CITP
  - AndyD        8-)#


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