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<blockquote data-quote="greybeard" data-source="post: 1063631" data-attributes="member: 18945"><p>Natural gas is a much better fuel than straight gasoline, E10, E85, or E100 (100% ethanol) . It has to do with the energy content and more importantly, the stoichiometric efficiency of each. For gasoline, it has a value of 14.7 which means under optimum conditions, modern auto/truck engines need and use 14.7 parts air to every part gasoline. The amt of fuel in this value is 6.8% for gasoline. This, is the standard benchmark that has been set for decades--14.7:1, because gasoline was the primary fuel for so long, and this is the target that other fuels try to meet or beat. (BTW--No engine can burn it's fuel/air mix at 14.7:1 under all conditions--it is changed via inputs from either carburetor throttle plate or fuel injection controls to keep from burning up pistons) </p><p></p><p>Any fuel that has a lower stoichiometric rating, is using more fuel (by mass) to air ratio to achieve the same energy output.</p><p>Diesel is very close to gasoline. 14.6 air to 1 part diesel (14.6:1)</p><p></p><p>Ethanol in E-10 blends (90% gasoline-10% ethanol) which is what most gasolines sold today are, is rated at 12.7:1 stoichiometric value. The engines are running richer than they were with 100% gasoline. Poorer fuel economy than would be possible with straight gasoline.</p><p></p><p>E85 (85% ethanol) gets a 9.8:1 stoichi rating.</p><p>Pure Ethanol has a 9.00:1 stochi but no internal combustion engine can start on 100% ethanol. </p><p>Natural gas on the other hand, has a 17.2:1 stoichi rating, better than any other fuel commonly available today. </p><p>Propane has a 15.5:1 stoichi rating. Better than gasoline or E blends, but not as good as NG. </p><p></p><p>Hydrogen, should it ever be perfected for fuel cells in vehicles, beats them all with a 34:1 rating. (I won't see it happen in my lifetime)</p><p>And for illustration purposes, (or for you few with Stanley steamers still out there) wood has a 6.1:1 Stoichi rating. Terrible, but it's cheap enough.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1063631, member: 18945"] Natural gas is a much better fuel than straight gasoline, E10, E85, or E100 (100% ethanol) . It has to do with the energy content and more importantly, the stoichiometric efficiency of each. For gasoline, it has a value of 14.7 which means under optimum conditions, modern auto/truck engines need and use 14.7 parts air to every part gasoline. The amt of fuel in this value is 6.8% for gasoline. This, is the standard benchmark that has been set for decades--14.7:1, because gasoline was the primary fuel for so long, and this is the target that other fuels try to meet or beat. (BTW--No engine can burn it's fuel/air mix at 14.7:1 under all conditions--it is changed via inputs from either carburetor throttle plate or fuel injection controls to keep from burning up pistons) Any fuel that has a lower stoichiometric rating, is using more fuel (by mass) to air ratio to achieve the same energy output. Diesel is very close to gasoline. 14.6 air to 1 part diesel (14.6:1) Ethanol in E-10 blends (90% gasoline-10% ethanol) which is what most gasolines sold today are, is rated at 12.7:1 stoichiometric value. The engines are running richer than they were with 100% gasoline. Poorer fuel economy than would be possible with straight gasoline. E85 (85% ethanol) gets a 9.8:1 stoichi rating. Pure Ethanol has a 9.00:1 stochi but no internal combustion engine can start on 100% ethanol. Natural gas on the other hand, has a 17.2:1 stoichi rating, better than any other fuel commonly available today. Propane has a 15.5:1 stoichi rating. Better than gasoline or E blends, but not as good as NG. Hydrogen, should it ever be perfected for fuel cells in vehicles, beats them all with a 34:1 rating. (I won't see it happen in my lifetime) And for illustration purposes, (or for you few with Stanley steamers still out there) wood has a 6.1:1 Stoichi rating. Terrible, but it's cheap enough. [/QUOTE]
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