I would be willing to bet that the fuel will be just fine. I've burned fuel so old it was probably pumped out of the ground using a steam engine with no trouble whatsoever. If you can start the engine on it, burn out about 10 gallons, fill up the thank and then change the fuel filter.

As for the 2,500 gallons in the storage tank, it would have been wise to use a more subtle method of pumping it into your vehicles. You didn't need to meter it, so you could have used a hand pump or an electric pump like the contractors use on the tanks in the back of their pickups to fuel construction and farm equipment. Oh well, hindsight is always 20 20.