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I agree w/UCrew...we've done several long trip/highway tanks at 500+, eg 525, 535. However, that has been done w/Out A/C on. UCrew's 3.0 probably gets better hway mpg than our 3.0 due to ours having the usually fun, very different, but engine screaming manual 5 spd., lol! My guess is a 4.4 without A/C on, should get very close to 500 on a flatish road trip.
BR,md
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