February 26, 2010
If All The Heat Energy In A Car Was Transferred Into Fuel Savings – How Much Fuel Would Be Saved?
I’m talking about the heat to cool the engine. The heat generated by the exhaust and the brakes. If this heat was converted to electricity or fuel savings, how much electricty could be produced or fuel saved?
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Filed under Gas Conservation FAQ by on Feb 26th, 2010. Comment. 
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Comments on If All The Heat Energy In A Car Was Transferred Into Fuel Savings – How Much Fuel Would Be Saved?
I think I recall estimates of efficiency for cars as being somewhere near 25%. In other words, 75% of the energy is wasted in heat.
[REPOST] The following lists efficiencies of both potential sources of energy in terms of converting to a form that a vehicle can use (“well to tank efficiency”) and various types of vehicle propulsion systems possible (“tank to wheel efficiency”). “Tank to wheel” efficiency of common current vehicles is listed as being 22%. However, the well to tank efficiency for same is 88%. 22% of 88% equals a total efficiency of 19%.http://www.memagazine.org/mepower03/gaug…
This is a very interesting page. For example, all-electric vehicles are capable of running at 44% efficiency (this is almost the most efficient form of propulsion, a hybird Fisher-Tropsch diesel is the highest at 45%), but unfortunately, production of the electrical energy required to charge electric vehicles is only 48%, yielding total efficiency of 21% – though still slightly better than current vehicles, it’s much less than I was aware of.