<VV> OLD FUEL?

[BRUCE BLACKMON]

Just wondering, does old diesel fuel act the same as gas and break down to varnish, or is it different? I ask because I have 2 gallons that are about 3 years old. I want to try a little diesel in the tank and then fill up so it mixes good. It is supposed to raise the octane level, and give you better mileage because it has more hydrocarbons that plain gas. I will try anything to get better than 13.5 mpg. Any ideas?