Being an old Chevelle SS guy (1968 427 L88 Open Chamber) and an old Cummins guy, might I suggest reducing cruising RPM.
I'm beginning to think that is the MOST important factor for hypermiling.
Just my 2 cents.
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Bob Sliwa
"Like a Midget at a Urinal, I knew I was gonna have to stay on my toes......."
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