Axio/Fielder will definitely have better average than Altis (1.6), Dont know much about 16'' Tires but with 15'' ground clearance was not good, so i had installed spacers.
Comfort of this car is really good for its category. I have not driven grande so cant say for sure, but i think grande will have poor average (comfort cannot comment); but JDMs have superior build quality, i am hopeful you would like Axio/Fiedler than local Corolla.
If your car is 4grade or above (verified); you dont need to show it to anyone (this is my experience);
A good battery can be driven for 1km easily (wihtout AC)
