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I've gotten 22mpg with an Auto 5.2 v8 dodge 1500, trust me, If I can do it in that thing you can definately do it in your infinately better GM.
If its a 2wd put small tires on the front end (I did with my dodge and it really helped, I think the loss of height was the reason that and they were LRR)
Things I have been considering are
1. Aero topper
2. Plenum gasket (shouldn't apply to you)
3. MT swap
I would estimate the best thing you could do would be an MT swap, it takes patience but remember the 700r4 and NV3500 were the same dimensions and XMBR wise, I would estimate with a bit of visual inspection you would find your XMSN and a MT counterpart might be drop in replacements.
I am right now waiting on getting me 89 diesel sub converted to double overdrive MT. I will actually need grandma gear to take off.
Something else you can do but everybody here hates is to reprogram the ECU the hard way using some of the freeware ECM utilities and move your maps past stoich in your highway cruise region (if you cruise on the highway a fair amount) thats good for about 2-4mpg in of itself. You need a good bit of tuning knowledge and patience to pull it off properly though.
Just make sure you can flop back and forth.
Good Luck
Ryan
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