No. You should not drive in overdrive all the time.
Overdrive is the normally allowed position ( it won't shift into overdrive until the speed is fast enough )
If it has overdrive use it! it is a "highway gear" it will make no difference what so ever until you get up to speed then it will shift into overdrive and save you gas!
Overdrive allowed is the normal position
Always use overdrive except when towing or going down a steep grade.
Overdrive use depends on speed, not weather. Can you drive at overdrive speeds, use overdrive. If you can't, don't. Often it's sensible to reduce speed in poor driving conditions.
Overdrive is the normally allowed position
Overdrive is the normally allowed position , but it won't shift into overdrive until the speed is faster such as on the highway / freeway
Drive is 3rd Gear. Overdrive is 4th Gear.
Overdrive is the normally allowed position , but unless the speed is higher it won't shift into overdrive anyway
Neither. Racing is almost always in manual transmission.
In most cases drive with overdrive especially if maintaining over 45 mph. Take out of overdrive if on slippery pavement