dear.....
1...eco zone tells u to remain in this zone but eco meter only glows when u r in that range.....eco means economy.....
2...automatic coroola is computerized so manual altis doesnot have eco zone.....
3...gli have only eco lamp no zone......
4.....odo meter is the one with speed info...other is rpm...
5...brother....its master check system gives u following info
...... a.distance u can travel with remaining fuel
...... b.averge consumption
...... c.time
...... d.averge speed
...... e.gears and rpm control is done by computer and it depends on how much u press ur feeet...if soft the ngear changes at 2.5 rpm if hard then 4.7 rpm
i hope u can understand what did i mention