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On the freeway, when driving cars with cruise control, I basically turn it on at a speed between 60 and 65 and leave it there; it's a lot easier than P&G. When driving my car, which doesn't have cruise control, I DWL between 40% and 60% while keeping my speed between 55 and 65. This clearly requires instrumentation, and it's much more work than CC, but it doesn't restrict traffic much and it's much more efficient in my car than P&G at those speeds.
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