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To: elmatador who wrote (35069)	5/22/2008 11:48:54 AM
From: Jim McMannis	Read Replies (2) \| Respond to of 220075

I thought they taxed diesel less.

To: elmatador who wrote (35069)	5/23/2008 11:51:46 AM
From: energyplay	Respond to of 220075

The author mentioned the energy density of diesel - it is actually heavier than gasoline. That is the easy to understand part. The other part is the higher thermodynamic efficiency of diesels because of their higher compression ratio. Diesel are about 30:1, gasoline engines about 9:1 Two minor effects come from the generally lower RPM of diesels - lower frictional losses, and the usually smaller horsepower of the diesel engines. Internal combustion engines run more efficiently closer to full capacity, so a 90 hp diesel producing 15 hp will do better 150 hp gasoline engine producing 15 hp. 15 hp is all that most cars require to move down the highway at a steady 50-65 mph. Of course, if you only have 15 hp, it will take all day to get to 60 mph....