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Congrats on the VX. You will love it, though it can be a bit tempermental. Mine is a fed vx with 130 K on it and when I got it it was lowered and the lean burn hardly worked. I was getting about 45 MPG then. It went up to about 53 once I got the lean burn working. I would definately get the lean burn going. Also, do a partial grill block. The grill block added a couple of mpg. The Lrr tires added about 3 MPG (and I just replaced 2). I would definately recommend the sumitomo htrt4 tires in the 165 size. Mine now gets 52 MPG in the snow and ice 15-20 degrees F, with 3 passengers!
Follow the advise of others on the site on putting the right spark plugs in and gap them correctly. also check valve clearance, air filter, cap and rotor. check ground wires. Since yours is over 300k I would check compression. I would guess that yours would have more trouble than mine getting high MPG just because of the milage on it.
For driving tips: With the lean burn it is more important to keep in lean burn than to keep the revs down on the uphills. Lean burn only works in 3, 4 and 5. Shift down to 4 or even 3 to remain in lean burn. On downhills, coast in N when possible. I have found that my car idles lower when I turn the fan off, so I do this when coasting long distances. I use the fuel cut quite a bit, but only when I dont want the momentum, like on steep hills to avoid using the brakes, or when approaching a stop. Otherwise coast in N for FE.
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