I wish had never seen this thread......
Have fun with these additional data points....I may not check back for a while
I just happen to have data from my BMW from the last 7 years that includes calculated mileage and the computer calculated mileage for every fill up. I also recorded if I used any fuel system cleaner, S1, FP60, FP3000 or techron. I have been looking through all this data all morning.
I'll just add a few more data points for the discussion.
I run mostly Chevron or Shell 93 octane.
Until Jan this year the fillups in Houston were all RFG with 10% ethanol.
Now in Indiana it is conventional gas with 10% ethanol
The first time added the 20 gal bottle of techron was at about 93xx miles.
Date mileage trip gallons actual computer
11/12/2003 9318 393.3 14.675 26.60 27.7
Next tank-
11/22/2003 9693 375.2 14.784 25.38 26.1
Next fill with Techron 20oz-
10/16/2004 17793 346.9 14.968 23.17 23.8
next tank-
11/3/2004 18124 330.6 15.008 22.21 23.1
Next Techron 20 gal-
11/2/2005 26391 292.8 15.038 19.47 20.3
Next tank
11/12/2005 26762 371.3 17.547 21.16 21.8
Three ozs FP60- several tanks in a row with FP 60-
5/9/2006 34343 250.4 7.843 31.93 31.7
after 8 tanks with fp 60 (2000 mile trip to Indy and back)
6/10/2006 37085 453.7 14.496 31.30 31.7
After 5 tanks without FP 60 - first Red Line S1
11/8/2006 39657 241.5 14.777 16.34 16.7
next tank-
11/28/2006 39920 262.8 14.816 17.74 17.9
I used FP 60 / 3000 off and on during 2007
Next Red Line S1 -
11/8/2008 63620 269.4 13.437 20.05 20.5
next tank
11/25/2008 63917 297.5 14.454 20.58 20.9
I used FP 3000 off an on again then this is the first fillup after many tanks - 2oz FP 3000
5/29/2010 83282 157.9 6.970 22.65 22.4
Next three tanks
2oz FP 300
6/8/2010 83406 123.6 5.486 22.53 22.6
Full bottle S1
7/5/2010 83692 286.1 14.128 20.25 20.2
Half bottle S1
7/31/2010 83988 296.2 14.244 20.79 20.8