I'll try my best to answer.
1. How long have you owned your Innova? (ODO Reading)
-66k+ and still kicking
2. What were the major part/s that you have replaced? (i.e. Radiator, Gas tank, Alternator,...)
-We're "affected" with the D4D problem. So far, replaced SCV, clutch repair kit.
3. As of now, how's your Innova in terms of Fuel Efficiency, Ride.
Fuel Efficiency-We get 12L/100km. That is city driving. 2.5k RPM maximum.
Ride-Changed our tires to higher profile. But when in stock, the ride for me was "good". But after changing to higher profile, the ride became "bouncy".
4. Did you replace your HU or TVSS (if you have one)? What brand did you replace it with?-Nope. But planning it to replace with 1-DIN Pioneer HU. We have an E unit so no TVSS for me. Alarm used-Autopage.