One option we're considering is outfitting a vehicle to perform smaller energy retrofits – typically air sealing, duct sealing and small-scale spray foam jobs. Very preliminary, but a couple of vehicle options spring to mind: 

1) A fuel efficient tow vehicle with a small trailer. The VW Golf SportWagen TDI is EPA rated for >40 mpg hwy, and can tow up to 2000 lbs. 
2) A small fleet vehicle such as a Ford Transit Connect. 

Currently the VW wagon looks more appealing to me, both because of fuel savings and high passenger capacity. How much of a hit would we take on fuel economy when towing? Also, would the setup appear totally unprofessional to clients? I don't know the answer to these questions.  

Separately, we've also started measuring some stuff with a ScanGauge, recommended by the ecomodder website. Turns out people think you'll be more successful improving performance if you actually measure stuff. Who knew!

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