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  #1  
Old 07-05-2012, 04:55 PM
p220sigman p220sigman is offline
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Default Mileage Experiment

I recently conducted a totally non-scientific mileage experiment with my '06 megacab. I had to take the kids to the in-laws 250 miles away of almost all interstate driving. On the way over, I set the cruise at 77 mph and stayed with that as much as possible only slowing once in a construction zone. GPS said the moving average was 75.8. Filled up right before getting on the interstate and filled up right after getting off. Calculated mileage was 13.68 mpg.

On the return trip, I set the cruise on 70 mph and tried to maintain that as much as possible. That was tough, but the gps said the moving average was 69.2 mph. Again, I topped off before getting on the interstate (I had done some in-town driving with the kids) and filled up as soon as I got off again. Calculated mileage was 14.89 mpg.

I was a little surprised there was that much difference with only a 7 mph difference in speed. I realize in order to have meaningful data, the same gas would have to be used and it would have to be repeated multiple times in the same conditions, but it was still a little surprising. When I had my GMC 2500 with the 6.0 liter gas engine, I didn't see much mileage difference regardless of if I drove 70-78.

Just for what it is worth. I love the truck and don't really care about the mileage. If I want mileage, I'll drive the Honda.
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Old 07-06-2012, 12:48 AM
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ArmyofOne ArmyofOne is offline
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WOW. I cant imagine 14mpg hwy. I would cry seeing that much money leaving my wallet that fast. I guess MDS does make a difference.
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Old 07-06-2012, 09:38 AM
p220sigman p220sigman is offline
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I agree. Fortunately, this won't be our usual highway travel vehicle. I was just surprised to see that it is as speed sensitive as it is. But, I get that big ol' grin when I drive it and you definately can't beat the interior room.
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