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!
If its a light load, if it will be frequently used its worth getting a transmssion cooler to save the trannys life. Its also a good idea when towing to drive with the over drive turned off. Overdrive isn't meant to handle a load, just to freewheel to save gas on the highway. Towing a load with the overdrive on can burn out the overdrive.
An over drive should enable you to save your fuel usage. It allows you to drive at the same speed, but using less revs, therefore you will use less fuel.
The gas regulator should be turned clockwise to admit more gas into the barrel.
you probably have a button or switch to turn overdrive on and off, it may be on the end of your shift lever, you probably want to keep the overdrive on, save you some gas, hope i helped
Typically "Drive" (4th gear on most vehicles) is your OverDrive gear (OD). Some vehicles have 5 and 6 gears. It is designed to run in a lower RPM range at higher speeds to save gas. The higher your engine is revving, the more fuel it is demanding and thus worse gas mileage. Unless you are towing, struggling up a hill, or need to increase speed without flooring it, you should leave the car in "Drive" or "OverDrive".
To admit more gas into the barrel, the gas regulator should be turned counterclockwise to increase the flow of gas. Turning it clockwise would decrease the gas flow. Make sure to adjust the regulator slowly to prevent sudden changes in pressure.
I would use the overdrive during normal driving. How ever if you need that little extra power then i would just turn it off. haveing the overdrive on all the time during normal driving " not pulling a boat or another car" should save you a little gas. just think of your overdrive as a half gear need more power go to the full gear
Overdrive is for highway driving, which is great for gas mileage. Also, not to use overdrive when going up or down hills because it makes your transmission work harder. That's what I was told anyways.
On my 4 cylinder I very rarely used 5th gear ( overdrive ) but on long trips on level ground it could save some gas. My 6 cylinder, on the other hand loved 5th gear.
One with good gas mileage.
Overdrive warning? Does it say "Overdrive Off" or "OD Off"? If so, it's not a warning... just an indicator. Most newer vehicles have this feature. On my Explorer it was on the end of the gear shifter. I just pressed the button and turned overdrive off. All it does it change the shift points for your transmission... saves a little gas when turned on (it's usually on by default). It makes my tranny shift at higher rpms so as to "get more" out of each gear... hope this helps.