If you are getting manual, stick with j variant. Only difference are mags, foglamp, steering audio controls and 2 additonal speakers with a 150k price difference. Toyota is offering 110k discount this month for j variant.
Kung city driving ka, pwede ka naman mag gas. Wala difference sa consumption ang gas vs. diesel. Pareho nasa 7km/liter. I drive a 2019 2.8E AT. Spirited highway driving gives 14-16km/liter
Usual problem ng innova are rear shocks, rust, water retention sa door shell (nagbabaha) and mine sira aircon, walang lamig. Pero malakas sa arangkada