Re: Gas Type?
I've used only 87 for 65000 miles in my 2003 model, no problems. A friend has an Escalade with the same 6.0 Vortec and it clatters on 89. The H2 was tuned for 87 and that is what my 2003 manual recommends (as I recall).
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Jim
2003 H2 Metallic Red (now gone)
2008 H3 Graphite Lux
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