gcncsuhd
+1y
I recently drove from Statesville, NC to my dad's place in Cherry Grove, SC then to Charleston, SC, back to Cherry Grove, SC then back to Statesville, NC for a total of ~750mi in one weekend. Up till that point, the longest I had driven it was my daily 60mi commute.
I can't imagine your Avalanche get's THAT much worse than your 4x4 B2600i to justify driving it on a long trip with no AC and if you are questioning it's reliability.... Our 02 Avalanche (5.3, 2wd, 3.42 rearend) gets 1mpg better than my B2200 highway, although my B2200 does about 4mpg under normal driving conditions around here.