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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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· Administrator, Resident Tater Salad
17,869 Posts
Hmmm. Interesting. Their website states it is an Eco tire. I'm not sure if that translates to LRR or not. But, if the MPG loss isn't too bad (1-2) then that might be ok if I get everything else to cooperate and get the MPG where I want it. I do have this mountain to traverse each day, so the grippy part may outweigh the need for the extra 1-2 mpg. If the weather gets too bad, then I'd want to take the Suburban. Talk about a loss of MPG! I'd rather take the Cruze as often as possible.
Most manufacturers have a LRR tire in their lineup, but few are engineered to be quite as fuel-efficient as the FuelMax, because a lot of trade-offs come with that (hard ride, low traction in rain).

If you want a great all-around tire, I highly recommend it. If MPG is your ultimate deciding factor, this is the wrong tire for that.
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