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I buy diesel 500 gallons at a time, when prices are cheap. I store them in 2 above ground containers. Diesel isn't volatile (evaporative), so it doesn't degrade over time. The water that accumulates is heavier than the fuel and isn't absorbed, so it can easily be drained off. The real enemy of diesel is micro-organisms that can grow in it given enough sunlight.
Gasoline is volatile and does absorb water (especially the ethanol part), which makes it a poor product to store for more than about a year.
I think I last paid $2 /gallon for my diesel. Cheap, but at 500 gallons, I still spent $1,000
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