The energy content of #2 diesel is 129,500 BTU/hr B100 biodiesel contains 118,296 BTU/hr or 8.65 % less than #2. B20 biodiesel blend is 127,260 BTU/hr only 1.73 % less than #2 diesel. I doubt if you'd notice a 1.73% drop in power. All other things being equal (water content, dirt and other contaminants, etc) biodiesel is fine for your engine and won't burn any differently in your oil furnace.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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