Doesn't make much sense, the car will only go into 4th (overdrive) if it's
going fast enough. Unless the car hunts between 3rd and 4th, leave it in
Overdrive should be the gear selected for normal opperation. I've been using
it for years without problem. Only downshift into drive if you're towing a
trailer, need some engine braking, or the car is hunting between 3rd and
If you're not using overdrive on the highway you might as well throw your
money away. In overdrive the engine will spin slower and won't use as much
Don't use the snake oil. Premium gas will be a waste of money. Even if it
did somehow improve mileage (in an engine designed for regular it won't) it
costs more, offsetting any benifet.
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