ChaseTruck
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... and I just don't think the OEM TRD SC would be the difference to 15mpg....
Yes it is.
..this and the fact it is a 20+ years junk....
Try my 31 year old K5 Blazer on the trail for a day or two, and you'll like the fuel economy of your LX a lot more...

In the rocks, the K5 likes about 1 gallon per hour.