Quote:
Originally Posted by ru'
It's rubbish, but statement is kinda 'based' on fact (petrol engines are about 20% efficient iirc). Doesn't mean 80% is petrol blown through the exhaust though. lol @ the rich mixture for cold starting petrol smell 'proof', and the cat for burning all that fuel which is 'wasted' out the exhaust... 
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At collage (Years and years ago) as a rough guide they told us....
25% Power
25% Noise
50% Heat
From 100% potential from petrol, If any goes down the pipe then the CAT gets melted....
So reducing friction seems the obvious way to get more bang per buck.