Thanks for the information and your experiences were similar to mine in many ways. I've never driven a ford v10 8.6l before and I'm glad to hear they pull well up hills and don't heat up. I would agree that interstates are usually not that steep. I usually use an app called TopoProfiler to check the grades on my route for planning purposes. But there are stretches that go up to 7.5% grade or so for usually only relatively short distances.
Sli22sli
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