That van most likely has 4.10 gears as I believe they only offer the 6.0L with 3.73's in the 1500HD pick-ups and VORTEC MAX. The 6.0L is one tough motor from what I have seen so far with little to no problems with them. Being an 09 that one probably has the new 6 speed tranny in it that came out in 07 and has proven itself to work nicely. I've never owned one, but realistically I would expect anywhere from 12-15 highway MPG's at 70 depending upon how it's loaded down. I know the 6 speed has helped the milage out on em quite a bit.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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