Hi Freeztar,
Quote:
Originally Posted by freeztar
It would be nice to do some ethanol experimentation, but I don't know where to get any around where I live.
Which equates to 31.7 MPG! Not bad for a 15 year old car.  |
You are doing the right thing already, the only extra thing you need to do is make separate records for the different fuel suppliers (or just add another column).
If you go through my posts you will see that CraigD provided a figure for Ethanol mileage equivalence of around 67% average. This means that for every 3 miles/Kms you get from ULP, you will get only 2 miles/Kms from Ethanol. By working backwards from any mileage difference you can work out how much Ethanol is in the mix. You should hopefully be able to get 100% ULP with no Ethanol to use as the base for your calculations if your local suppliers are telling the truth.
1. Record Mileage from a full tank of 100% ULP (0 % Ethanol)
2. Record Mileage/Supplier from a full tank with unknown Ethanol %
3. The Ethanol Mileage Equivalent Loss (EMEL) = 1.-2.
(i.e. 1/3 of ULP mileage is the loss)
4. The total miles under Ethanol in mix 2. = EMEL x 3
(i.e. 3 times the loss, EMEL x 1/(1-0.67))
5. The Ethanol % in mix 2. = 4./1. x 100 percent
If you get a negative figure in 3. your base probably isn't 100% ULP.
Like me you will probably get different figures from different companies, and like me you will only go to the companies that don't rip you off.
p.s. All of my calcs were based on 92 octane fuel, it's good that you keep that consistent too.
