If you, or someone else, has some real-world data on your mileage using some well-defined mainstream sort of biodiesel, then I'd like to look at including it, if the data is well-kept. We'd need to have a good idea of the MJ/gallon of that particular type of biodiesel, so as to calculate MJ/mile or mile/MJ. Then, if the data is kept on a car that has a standardized original engine for which there is EPA data for the whole system we could also post that data next to it, and make a note that, regardless of which is more energy efficient, the biodiesel is of a far more sustainable approach, has lower net CO2 emissions, amounts to recycling of waste in some cases, maybe with a link for where folks can buy some and have it delivered, etc.
>Automotive gasoline has an energy density of 34.2 MJ/liter, while >automotive diesel fuel is 38.6 MJ/liter. There are 3.78541 liters per >gallon, so gasoline's energy density is 129.46 MJ/gallon, while diesel's >is 146.12 MJ/gallon. > >So, with the TDI engine, you can go 50 miles (highway) on 146.12 MJ, so >you use 2.922 MJ/mile. With the gasoline engine, it's 30 miles (highway) >on 129.46 MJ, so that's 4.315 MJ/mile. So, with the diesel engine in that >car, you are using 32% less energy per mile. Hm, looks more efficient to >me. So, measuring efficiency on miles per unit energy (actually, I >calculated energy/mile, but same thing, just flip it over), diesels (at >least the TDI) are a good deal more efficient. > The fact is, gasoline engines are around 25-30% efficient. Modern >diesel engines are in the 50%+ range in use, with some research programs >getting efficiencies up to 65% on new engines under development. > And when you factor in that diesels can run on biodiesel so there >is no net CO2 emission, it's a HUGE difference in terms of pollution/mile. ------------------------ Yahoo! Groups Sponsor ---------------------~--> Home Selling? Try Us! http://us.click.yahoo.com/QrPZMC/iTmEAA/MVfIAA/FGYolB/TM ---------------------------------------------------------------------~-> Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
