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Not getting the MPG I think I should

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So, my normal commute is 37 miles one way, with about a 2000 ft elevation gain on a 2 lane road. I've had worse commutes... That being said, I've been averaging about 33 MPG per tank. Ok, I understand with the mountain, that's not bad. But over the weekend, I took interstate from home to Black Mountain, NC. I-77 to I-40. Even with cruise control set most of the way at PSL (70, then 65) I only got 37 MPG average. On the way home, the trip started down a big mountain, so I was able to average 42. Not as good as I was expecting.
What items should I be looking at on my 2014 CTD?
I've already:
Changed all filters except the fuel filter. (Dealer changed that right before delivery, there is still 47% life on it.)
Put in amsoil oil and transmission fluid. (Flushed transmission)
Cleaned the MAF.
Tightened the 5 hose clamps from the air filter onwards.

I was thinking maybe have the dealer:
Reset the LTFT
Flash the HVAC (I have the humming noise when the car shuts off, and if I maintain 70 or greater with RPMs 2K or over, the A/C shuts down - but that's another story.)

Any other things I should consider?
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Get your brakes checked - something's dragging. At 70 MPH you should be running in the high 40s for MPG. Also, when descending put your car into metric and make sure the instant fuel consumption readout drops to 0.0 L/100 KM. This will verify your car is going into DFCO properly.
 

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All the diesels I work with average 33 mpg to 38 mpg. Before I messed with them that is.

Sooooo don't feel too bad. I'm not really sure how people on here get ludicrous numbers like 55 mpg without really changing anything. Maybe, just maybe, if you had a long stretch of road going 55 mph you can do it, but otherwise you are SOL.
I didn't think South Dakota had large enough cities to drag overall MPG down this far. I know from experience that my ECO MT is a 55 MPG car at 55 MPH and the EPA rating of 42 MPG is at 77 MPH. The CTD has a 4 MPG improvement on the highway so it should do better than my ECO MT. City driving will drag the CTD's MPG way down - rated 27 MPG City. A combined 33 MPG would be an average speed in the low 30 MPH range.
 

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80 mph speed limits will do that ;)
I feel the need for speed :th_coolio: Sounds to me like I need to make a road trip to SD and open her up.
 

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When you're traveling 1,400 miles one way hauling a trailer, fuel economy is the least important thing haha.
Understood. On my three trips from Denver to New Hampshire that I've made in my ECO MT "fuel economy" has been at the bottom of my trip criteria. I just let the car do what it can for me and don't worry about it.
 

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Did this on the way home yesterday - worked as expected. (And going down the mountain raised my average for this tank to 34.)
OK - next test. On a relatively flat stretch of highway (rolling hills are ok as long as up and down are roughly equal) reset one of your trip odometers and watch the average MPG vs. average speed. Report distance, speed, and mpg numbers in both directions on this stretch of road please. What I'm looking for here is to see if your car is performing properly on the highway.
 

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Ok... Shall I set cruise control? I think there is a (mostly) flatish stretch on the way to Winston-Salem. I should be able to do this Sunday.
I would use cruise control for this. The cruise control in the Cruze is the best I've ever seen.
 

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I've been using ACar on my phone, that does the calculations from mileage / gallons and I keep an eye on the DIC to get a general estimate as to how I am doing. The ACar app is what I am ultimately going by for the MPG per tank.
The only way to accurately measure MPG over the long haul is to record your odometer reading for each tank and the number of gallons filled. I use Excel and Fuelly for this purpose.
 
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