...duh! ALL hydrocarbon fuels emit carbon-elements (carbon-monoxide, -dioxide, etc.) upon combustion, just in differing amounts
...gasoline is roughly C(8)H(16), while ethanol is C(s)H(5)OH
...you want LESS pollution, walk, because ethanol is not carbon-free!
...I envision a variable-compression (ie: turbo-charged) engine running on E100 as a viable alternative...IF & WHEN the industry gets around to offering it. But, E100 will co$t more than petroleum, so it'd better get damn good FE or it'll fail and we'll be back to sucking the petro-bottle again.
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