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Gasoline Energy Density = 11.8 kWh/kg
Typical Gas Tank Size ~ 20 Gallons = 55kg
Gasoline Engine, Transmission, Gas Tank & Exhaust System Weight = 700 kg
Gasoline Engine Thermodynamic Efficiency 25%
Typical effective energy density of gasoline system = (all the energy/all the weight)*efficiency
((11.8*55)/(55+700)) * 0.25 = 0.215 kWh/kg
Lithium Ion Energy Density 0.266 kWh/kg
Case in point Battery Size (85kWh) = 320Kg
Electric Motor, Battery Pack Structure and Inverter Weight = 100kg
Electric Drive Thermodynamic Efficiency: 90%
Typical effective energy density of state of the art electrical system = (all the energy/all the weight)*efficiency
((0.266*320)/(320+100) * 0.9 = 0.182
Put this together and we have an example of a system that is 182/215 = 85% of the effective energy density of gasoline ALREADY!!!!!!!
That means 15% away as an overall system from proving that a gasoline range extender is technologically pointless.
Considering that all of the improvements to close that gap would need to come from improved energy density cells (unlikely to reduce the weight of motors and inverters).
We are looking for an energy density improvement at the cell level of
(420/320)*.15 = 20%
That is the whole story right there, 20% improvement in battery energy density makes gasoline in all its forms unnecessary for all vehicles either as a main source of on-board energy or as a range extender.
Former Silicon Valley test engineer, marketing and market research analyst. Performing stock research, especially on Pink Sheet and OTC stocks, has become somewhat of a hobby for me.
I've been an individual investor since 2000, and generally invest in small cap NASDAQ stocks, with a few NYSE dividend-payers in the mix.
BS in Economics, MA in Public Policy (International Economic Policy). J is a well-known voice in the global shipping community, with unparalleled investment results and a penchant for activist investing.
Mintzmyer founded Value Investor's Edge, a top-ranked deep value research service in May 2015, with the goal of establishing a top-tier community of deep value investors and activists. Value Investor's Edge subscribers leverage exclusive in-depth analytic reports and community investment experience to discover disconnects in global shipping and a variety of other beaten down sectors.
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Just a smelly ole sea (now retired) cap'n, ran a successful cruise business, an overnight sensation 25 years in the making.
Former stock broker 30+ years ago... realist, use all data I can to keep me out of politics.
Just want to make a few bucks a day to keep me off the work rolls.
Currently use money manager(s) 
Main focus for me is I trade numismatic coins and write articles about them for NGC
Long a buy and hold investor, I now believe that buy and hold has to be re-evaluated in a world of ever increasing, instant information and huge gyrations in markets all over the world.
A value investor at heart, I anchor my portfolio with conservative funds and blue chip dividend stocks, but have enjoyed great returns by utilizing a portion of my portfolio on microcaps, cleantech and new technology stocks.
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Dana Blankenhorn http://www.danablankenhorn.com has been a business journalist since 1978, and a futurist all his life.He warned about the coming Houston oil collapse in 1979. He began making a living on the Internet in 1985. He launched the first e-commerce daily for CMP in 1994, warned of the coming dot-bomb at a-clue.com in 1997 and began covering the Internet of Things in 2003.Along the way he's written for a host of newspapers, magazines, news services and Web sites. Most recently he was at TheStreet.com, covering technology and investments. He still has time for freelance assignments. He lives in Atlanta.
Glenn Rogers is a longtime contributor for BuildingWealth.ca (http://www.buildingwealth.ca). His background is in Media and Publishing and has held a number of senior positions in major magazine and newspaper organizations.
He has also successfully partnered with private equity firms to acquire, operate, and divest media companies.He has had extensive international experience and looks for investments globally.
He is currently based in Laguna Beach ,CA.
I am an American trader and a Vanderbilt University alumnus currently living in San Francisco. I'm mostly interested in income investing using dividends, preferred stocks and other debt instruments, and pair trading.
I fundamentally analyze every business from the top down.
In my personal life, I have a strong Jewish faith and enjoy playing Scrabble and entrepreneurship.
Kofi Bofah is a 2002 graduate of the University of North Carolina. After graduating from UNC, Bofah worked as a financial adviser with American Express. On Jan. 12, 2004, Kofi Bofah was to found Onyx Investments, Incorporated, in Chicago Loop. Onyx Investments offers fee-based financial advice, asset management, insurance brokerage, and tax planning services. Interested parties may visit the website www.onyxinvestments.com for more information about Onyx Investments.