DANIEL TINDER (3/21/2011)
[b]46yblock
In 1987 I had a little Suzuki made Chevy Sprint with 1.0 L engine. The daily commute to work was 73 miles so I kept records of mileaage with each tank full. Each week it was a rock solid 49 mpg on clear gas. Tried E10 to keep less dollars going to camel jocks and mileage was 45 mpg, same drive, same everything.
So, 10% less petrol gas = 10% less mileage. What's the point of adding ethanol? Will engines run on 10% water? We still have plenty of THAT. Maybe the arabs would trade straight up, as they will likely run out before us?
Actually, it doesn't mean a 10% Alcohol/90% gasoline will produce a 10% reduction in mileage since the over all reduction in BTU's per gallon is much less than 10%
Ethanol will produces (about) 75,000 BTU per gallon.
Gasoline (Petrol) will produce about 115,000 BTU's per gallon.
SO if you do a simple calculation (0.90gallon of gasoline) 90% of 115,000 = 103,500 BTU
0.10 gallon of ethanol = 10% of 75,000 BTU....... or 7500 BTUs in 1/10 gallon of Ethanol.....
Mix the two together to total 1.0 gallon and you get 103500 + 7500 = 111,000 BTU energy in a (1gallon) 90/10 mix of Petrol and ethanol.
That's only a reduction of 4000 BTU in a gallon of E10............... 3.4%
A 3.4 % drop in heat energy would not result in a 10% reduction in mileage....
And a 3.4% reduction in mileage at 20 MPG would only be 0.68 MPG. .......... not even measurable for most of us.
The only real way determine the difference would be to put an engine on a dyno, run it up to a fixed power output and measure the fuel flow and then change to the test fuel and then adjust the power output if it dropped. Then measure the fuel flow increase
I have used E10 for many years in a variety of engines I have not been able to tell any difference.....
But to be fair, this summer I am going to start driving my daughters car back and forth to work. It's a 2003 Chev Cavalier with an EFI 4cyl engine and a 5 speed manual trans.
I have driven it to work in the past running E10 and consistently got around 35 MPG.
Since I have a line on alcohol free fuel locally (and after I test it for purity) I'll drive it back and forth to work for several tanks and I'll see if there's any difference.
If the E10 is giving me a 10% reduction in mileage, I should immediately see in increase of at least 3 MPG to 38 MPG. (I'll run it nearly out of fuel before I fill it up and I won't check until the next fill up after that.)
It'll be an experiment!!!!
Cheers,
Rick
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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!
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