Flex E85 relates to engine calibration for fuels containing a high percentage of ethanol.
E85 can contain approximately 85% ethanol, although the exact fuel composition can vary.
Because ethanol behaves differently from conventional gasoline, the ECU may need different strategies
for:
fuel quantity,
ignition,
lambda targets,
cold starting,
load calculation.
Flex-fuel calibration is therefore much more than simply changing a fuel type setting