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Are those electric assist bicycles? If not then you need to measure their efficiency in Snickers Bars per mile. :)
 

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Looks good! I had my two electric assist Trek bikes on the back of my Gen 1 volt, me, wife, and camping gear, half a tank of gas and when weighed we were within 35 pounds of the GVWR... something to think about. My MPG also went from the low 40's to the low 30's...

I don't carry the bikes on the volt for long trips anymore. Good luck!
 

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.... I had my two electric assist Trek bikes on the back of my Gen 1 volt, me, wife, and camping gear, half a tank of gas and when weighed we were within 35 pounds of the GVWR... something to think about. My MPG also went from the low 40's to the low 30's... ...
OH NO,,,
You know what would happen if you had your In-Laws in the back with a full tank of gas and you were now 350 lbs over Gross?

Absolutely nothing.:p

Also 10 mpg drop due to the dirty aero of bike hanging off the back seems like a lot.
Did you measure a round trip, accounting for wind and elevation change?
A one time, one way trip is not ideal for measuring MPG.
 

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Also 10 mpg drop due to the dirty aero of bike hanging off the back seems like a lot.
Did you measure a round trip, accounting for wind and elevation change?
A one time, one way trip is not ideal for measuring MPG.
Also weight deforming the tires differently (both "down" and "outward"), increased power to maintain "spritely" acceleration, etc. Many factors all play in this, but all come from a few hundred extra pounds in the car.
 
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