100,000-mile B20 bus road tests: biodiesel increases operating costs slightly, reduces emissions
The major negative for the biofuel was a higher per-mile average maintenance cost (seven cents vs. five cents), but "engine and fuel system maintenance costs varied widely from bus-to-bus so the $0.02 per mile average difference between the two groups is not statistically significant," Some of the cost comes from road calls where the fuel filter needed to be replaced, and the delay in service is "significant to the transit district," NREL's report says. On the plus side for biodiesel, there were lower soot levels in the B20 buses and lab testing shows "reductions in all measured pollutants, including a reduction in nitrogen oxides."
You can download the full 14-page report in PDF here.
[Source: National Renewable Energy Laboratory via Imperium Renewables]
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