As for A/T users, always keep overdrive (OD) ON. Many confuse this thing as a performance booster, which implies more consumption. Actually, it's the other way around. With OD on, the transmission uses all the gears, while if it's off, it will not use the top gear. Switch OD off only when:

- going down a steep road (to provide more engine braking)
- towing a trailer while driving uphill
- in the middle of stop-and-go driving
my car doesn't have an (OD) Overdrive button... mayroon "HOLD" tried pusing on and off and nothing happens except for a illuminated HOLD light in my instrumentation pannel... to be honest don't really know whats that HOLD is for...