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The Pub For General Automotive Related Talk |
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12-10-2009, 08:34 AM | #11 | |||
I miss my wheelbarrow
Join Date: Jan 2005
Location: Bluestreak Performance
Posts: 11,503
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Quote:
Instead of saying that 6 vs 4 is 50% less (actually sort of correct not allowing for the fact that its really 7 vs 5 as the cars are full at the start) look at it in terms of % increase........... like 7 tanks of E85 instead of 5 tanks of Ultimate 98 means the consumption is around 40% more AND THEN you dont make an **** by going on to say that the fuel would have to be 1/2 price (thats like saying the consumption is 100% more!) Facts are that based on Stoichiometric fuel ratio, E85 (with its 9.7:1 stoich point vs gasoline 14.7:1) should be theoretically around 40-50% heavier on the km/litre burn rate than Unleaded, but with the engine tuned for lean running that can be brought down to around 30%, and with optimised compression ratios (15:1 on a NA car) making better use of the higher octane levels and reduced Nox levels, the greater thermal efficiency can get the economy within 12-15% of gasoline products. Daniel |
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