I'm getting 11-12 in city and 16+ on highway on my 1.6 GLX Auto.
Idle valve did fail and it's a problem with all cars. No electronic failures till date.
Car is still on original water pump, thermostat and radiator with no leakage or overheating at any time. No overheating even on steep hill climbs with full load and AC on. All depends on how you keep the car. Fluids are most important.
CVT only uses the Mitsubishi Diaqueen ATF SPIII fluid which is also mentioned in the owner's manual. I've always used that and the transmission is running fine.