Bro you are full of it. My advice if you have no clue what you're talking about you should not be posting.
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I am confused as to which part of Bolens 1000's post you are disagreeing with. The first paragraph is correct, when unleaded fuel was introduced valves/seats had to be made differently.
The second paragraph is also correct, a cheap HF infared thermometer will show you that. Easy test, run 10% ethanol, check the head temp. Drain gas, use non-eth fuel and re-check.
Ethanol burns hotter than gasoline.
Ethanol has less btu's per gallon. That's the easiest to check. If you have or know someone with a flex fuel vehicle, ask them their mpg using both fuels. Normally, E85 gets 25% less mpg than E10. My FIL has a '07 1500. 19-21 mpg on E10, 14-16 on E85.
Ethanol pulls moisture from the surrounding air. It tarnishes and leaves deposits in carbs if left idle in as little as 3 weeks in some environments.
His last paragraph may be open to interpretation. If going by pollutants released per gallon burned, his statement is false. It would be true if you were going by emissions per btu.
Or maybe he was just commenting towards the well documented fact that it takes 1.2 - 1.3 gallons of fuel to make a gallon of ethanol.
If you knew Brian at all, you would be very well aware of the fact that he knows small engines inside and out. Rather passionate about them, as a matter of fact.
Edited by Austin, August 24, 2016 - 10:10 AM.