a very interesting article where a 'real' comparison was made between fuels ... regular, higher octane, no ethanol, and super high octane racing fuels ..... https://grassrootsmotorsports.com/articles/fuel-truth/ if the link won't work pasted into a browser send me your e-mail and I can send it to you ... I saved it. A most curious result was that as compared to 93 octane E-10, 93 octane eth' free resulted in lost HP and torque despite much higher cost . . .

yea, I know ... it was a Miata ..... but a very tuned Miata . . .

 

neat stuff, thanks for sharing!

 

totally not relevant to real world driving on the street ... performance was tested at 1 rpm with the engine re-timed to achieve peak power

i see 4-6 mpg more with 91E0, 92E0 or 93E0 than with 92E10 or 93E10 ... it is repeatable and consistent ... i have seen 8 mpg higher when running a whole tank out on the interstate ... 42 mpg on my 2012 cms all4 (500+ miles per tank!) using 93E0

the car also starts easier and runs smoother (especially when cold) with any flavor E0 than any flavor E10

 

You got to love the methanol. Significant gain in horsepower.