They get 120 to 132 miles per gallon on diesel fuel and if I can produce my own bio-diesel from algae I would almost be riding for free.
http://www.dieselbike.net/commercialproduction/commercialproduction.htm
http://www.olive-drab.com/idphoto/id_photos_m1030_m1d.php
It wouldn’t have to be some big cruiser. I would just need a 450cc to 850cc size bike for around town, probably a dual sport or motard style bike.
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The problem here is the supply. Motorcycles and cars are priced where they are because of market pressure, and none of the largest manufacturers have switched to diesel yet.
This seems unlikely to ever happen, given how diesel engines perform. In order to go any reasonable speed, a motorcycle needs to create horsepower. Diesel engines create a ton of torque at low RPM (which leads to fantastic acceleration), but their RPMs remain low (which means low HP and terrible top speed). Even if you were able to swap a diesel engine into a gas-powered bike, the close gear ratios would be an issue.
There are other issues with diesel, such as putting a large-displacement long-throw engine on a cruiser.
There really isn’t much of a place for diesel engines on anything but the smallest bikes, and it seems likely to remain a niche market.
Only if they go into mass production, with short runs and one-offs the price of components will not go down. The compression required for diesels is a factor in their lack of use in bikes, the strength required dictates heavy engines.