Yep, slightly lower BTU and will run to much lower temps without turning to goo. I got #2 over in Idaho at a truck stop that had both. Over on the west side of the mountains we never see #1. It does not get that cold.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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