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Assuming zero drag and rolling resistance:
You lose about 85% to 90% energy in an electric motor, so accelerating and braking with a KERS gets you back 90% of 90%. So you lose ~18%
If you dont accelerate and brake, you dont lose any.
If you do assume drag and rolling resistance then the hard driving case is affect more, because drag is proportional to the square of the velocity. drag = 1/2 * cd * roh * area * v^2.
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You certainly need to assume drag + rolling resistance, or there'd be an unlimited top speed! "Hard driving" doesn't necessarily mean higher top speed (in fact I assume it doesn't, since top speed is normally dictated by traffic conditions and/or speed limits). But accelerating harder and braking harder can be more efficient, especially wrt braking, when using KERS. So a reduction in range of ~30% when driving "hard" seems perfectly feasible in an all-electric car, especially one designed for high speeds and therefore with low drag / resistance.
To the member on here involved with the car's development... do you guys need any testers? 
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The problem isn't the electric motors, it's the batteries.
When used hard they get hot which raises the internal resistance until they get practically useless until cooled down again. (Or you get a thermal runaway)
That's the reason there is no official times for Tesla around the Nordschleife.
They can't make a whole lap without going into limp home mode.
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Hard driving means constant acceleration and braking. Even with KERS you are losing energy because the motor/generator is not 100%.
Add in the higher top speed with hard driving and the additional drag and the energy consumption is much higher than normal driving.
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Slow it's definitely not. As for efficiency, I know Jack and s*** about it and Jack is out of town  I was involved with the HMI, for the rest I can only state what they stated.
I drive a 2003 Fix It Again Tony, I'm definitely not into cars
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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I worked on that 
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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That's a pretty damned cool thing to have been involved with!
Whenever you find yourself on the side of the majority, it is time to pause and reflect. - Mark Twain
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Absolutely! Actually I have still some support work to do on that but the project is already closed and onwards we move to new horizons.
I so much prefer my new job to the previous one.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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It's always nice to be able to have something to point at and say "I was part of that!" Most of what we do as developers is so abstract and ephemeral that we don't often get the chance.
Whenever you find yourself on the side of the majority, it is time to pause and reflect. - Mark Twain
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Yeah - Herself would get annoyed by my wandering around supermarkets going "I designed and coded the machine that printed that", until I got her involved in the hardware manufacture for the next generation and then she went round supermarkets going "I built the electronics that made the machine that printed that work".
Even now - fifteen years since I last touched one - I see "my code" being used all over the world!
Nice feeling.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: Even now - fifteen years since I last touched one - I see "my code" being used all over the world!
Much need for printers in porn?
Michael Martin
Australia
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible."
- Mr.Prakash One Fine Saturday. 24/04/2004
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Loads! You didn't think those tattoos were real did you?
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Unfortunately most managers - those who weren't developers - don't appreciate the emotional attachment / pride we can gain from our coding work. One of the first places I worked, I spent 4 months developing one bit of code before moving on to another project; the manager never even let me know when my first "masterpiece" had gone live and I felt very cheated.
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cool
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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The HMI part. It is almost entirely controlled through 2 touchscreen and a driving display.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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And the battery lasts a few minutes longer than the tires? 
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... I know he means well!
Ba-tish! I'm here for the rest of the week!
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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Never argue with a fool. Onlookers may not be able to tell the difference.
Mark Twain
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Nice joke... I dig it!
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Glad you liked it - it was quite an undertaking to come up with it!
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
-
Never argue with a fool. Onlookers may not be able to tell the difference.
Mark Twain
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thought it was a serious message, fell right into it.
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I feel I've been roped into it.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Ah, I got pulled into it.
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