Just bought new 09' Lariat, wow the 6.4 is much better than advertised, mileage so far hwy 17-19 in town 14-15. I only have 900 miles so not even broke in. Had a 02 7.3 that got 21-22 so this is not bad for new.... The 6.4 has the potential to produce more power than any diesel on the road, and very quiet... I drove the 6.7 very nice, but new would give it a couple of years, 6.4 is a great motor...
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