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Run it on cruise control constantly. And just below the flow of traffic. 2-3/mph below posted on less; maybe 67-68/mph.
Ideally, never change lanes. Avoid packs of vehicles by cancelling cruise until they’re away.
Your drive time won’t change enough to run faster. That’s eaten up by traffic volume problems.
Tires to recommended pressure.
Plan all stops in advance. Two hours or 100-miles apart, roughly. Have that done the night before.
Someone who sits in the Interstate left lane (illegal, only for passing, not overtaking) is doing a bad job of of driving. Risk too high. And costs go up.
When convenient, bring all factory service to date. Time, not just miles.
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