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26.5 mpg over 700 miles mixed driving

8548 Views 18 Replies 11 Participants Last post by  Haulin
I purchased my truck as a demonstrator so it already had 5300 miles on her. After driving 700 miles mixed with about 60% city and 40% highway, I'm averaging right at 26.5 mpg. The EVIC was very accurate on the first tank of fuel showing 26.5mpg compared with 26.4mpg calculated. I'm averaging close to 27 on the EVIC now with the second tank of fuel. I would say I've taken it fairly easy over the 700 miles with driving aggressively only a few times. It definitely sucks down some fuel if you get on it regularly and I could see dropping below 20mpg in the city if I drove it hard.

I have a 2wd Laramie Longhorn with 3.55 gears.
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I'm brand new here & I just purchased a Laramie Long Horn Ecodiesel last weekend and I have roughly 350 miles on it so far in a mix of 50-50% city/highway driving. I'm a little disappointed as I'm averaging 20 MPG. I had hoped the highway would be better, but I realize it had less than 5 miles on it when I bought it. When will the mileage begin to climb for the highway?
I bought it Saturday, drove it around in the city & Monday drove it home (straight 210 miles) at the posted speed limits of 75 & 80 WITH the cruise on.

I called the dealer today & they said it still needs to "learn my driving habits for about 500-1000 miles. I'm heading out to do this round trip again. & see what I get. The dealer did not give me a warm fuzzy when they said "most ecodiesel customers are getting 23 highway with their 2WD 1500s...". That figure is a lot lower than what I've seen posted on these forums!
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Well, I did the 210 mile trek again yesterday, & my average is up to 25mpg now. I'm not doing any stop & go until the very last 2 miles off the interstate. I used the cruise as much as possible, but I didn't notice the weirdness of speeding up. It was very smooth.
One thing I did notice that I thought was weird on the mpg EVIC is that the display is not proportional; i.e. going uphill displays 10mpg, but going downhill displays 80mpg! That was just weird.
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