Depends.... The reality in this world is that one really has NO idea what the oil company is selling you for offroad diesel. It might be furnace oil. It might be furnace oil cut with kerosene. It might be diesel fuel that simply has die added. There is a significant difference between furnace oil and diesel... mainly in the additive package (cetane improvers, etc.) but also the fact that furnace oil does NOT have the sulphur removed while diesle does... Generally the removal of the sulphur takes with it something like 2% or more of the BTU content of the fuel so you will see a reduction in fuel economy with ULSD. In this case... your friend may have gotten died furnace oil cut with kerosene or simply a winter grade of fuel and he's been using that up and is comparing that to a heavier grade of summer blend of pump diesel. The summer fuel WILL give better economy. There are many plausible explanations for the scenario you present...
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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