On our cars with a flex fuel kit and tune you can run either or and any mix of the two with no need to switch maps.
Can't say my observation is the same for others but I only lost about 12% MPG from 91 to E, my savings are 19%. Include the power gains and that is more than a wash.
SPG is priceless 
__________________
Mr Russ
Tim "the tool man" Taylor is my hero
My Garage:
'16 Chevrolet Camaro 2SS, Summit White, Adrenaline Red
-- Rotofab CAI, Soler TB, 1 7/8 coated LT's, Full 3" mids, 3" Stainless Works NPP mufflers, Flex Fuel, E85/91 tuned
'20 Honda Oddysey Elite 25th Anniversary Edition
--wifes car, she said "No more SUV's" after the 2 CX-9's totaled
Last edited by MrRuss; 05-15-2021 at 05:02 PM.
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