Thanks to those who replied to my inquiry.  My instinct is that a real engineer 
with familiarity of the cars design would be needed to pull this off.  

David Roden  makes some very interesting points.  He points out that the 
emissions are high for less regulated motors. The pollutants that he sites are 
CO, NMHC + NOx.  This certainly give me pause for moving forward.  CO2 is 
definitely a motivator for me.  The emissions for this are gallons (10% 
ethanol) typical x 19#CO2/gal (epa website ).  

I have evaluated the actual gas mileage using David’s metric of m/kwh x speed 
to determine kwh/h or kw of continuous power.  I would need 14.3 kw generator.  
Using this 15 kw generator
 I end up with a mere 18.75 mpg not accounting for the reduced m/kwh for the 
trailer.  Our Honda Element (2nd car) gets 25 mpg.  The trailer would only make 
environmental sense if we can go back to using renewable energy while we are at 
the destination. My figures are pasted in from spreadsheet below.   

Though Davids prototype gets higher m/kwh than the leaf, I still promote the 
all electric car for local use.  This 80 mile range achieves 75% of our annual 
auto transportation needs.  We added photovoltaic array to produce as much 
power as this consumes.  This greatly reduces our CO2 emissions for auto 


Generator Evaluation
      Milage (miles/kwh) 4.2 
      Average Speed (mph) 60 
      Energy needed per hour (kwh/h)         14.29  
      Continuous power needed (kw)         14.29  
      gas tank(g) 16 
      Run time at 50% power(hr) 10 
      Run time at 100% power(hr) 5 
      gas consumption at 60mph(gph) 3.2 
      gas milage at 60mph(m/g) 18.75 

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