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i've never used cause i don'tknow how;tried once or twice but nothing happened-searched & found 5 problem discussions but noone goes in to how to use
A turbo can be used to plow, plant or harvester an entire farm at once. Select which vehicle you want, then click the Turbo tank in the lower left, then click any plot, wait a few seconds and the task will be done. The only problem I have ever encountered is with crops that have just reached ready to harvest, sometimes the plots you don't see do not ripen until you see them (those in the "corners") so zoom out until you see all of your farm if you are harvesting.
Any Turbos in your gift box need to be added to the tank before you can use them. The Turbo tank does not become visible until you select a vehicle to use, if you need screen shots let me know.