I did the MPG study in my 2003 corolla with 10% ethanol in BP gas vs 0% in Chevron gas.
9 tankfulls, 100% city driving, alternating between BP and chevron gas.
There was a slight difference in means (E10=28.1 MPG; E0=28.64 MPG) but it was not statistically significant (p=0.56).
This was in contrast to the first impression when I got 26.4 MPG with E10 and it went up to 27.7 with E0.
The lesson is, changes bases on a single tankful can be misleading.
BTW, the range was 26.4 to 29.8. Both the highest and lowest was with E10.
9 tankfulls, 100% city driving, alternating between BP and chevron gas.
There was a slight difference in means (E10=28.1 MPG; E0=28.64 MPG) but it was not statistically significant (p=0.56).
This was in contrast to the first impression when I got 26.4 MPG with E10 and it went up to 27.7 with E0.
The lesson is, changes bases on a single tankful can be misleading.
BTW, the range was 26.4 to 29.8. Both the highest and lowest was with E10.