This device uses about 50% less fuel than current DPFs and shortens the regeneration time to 5 or 8 minutes.
http://www1.eere.energy.gov/vehiclesandfuels/pdfs/merit_review_2012/propulsion_materials/pm041_lance_2012_o.pdf
A homeowner has asked me to cut some big high dead branches off two pine trees. Most of the cutting would be done with a manual pole saw, I estimate about four days work. The city he lives in will pick up the branches that are cut off. What is a fair price for this kind of work?