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2014 Silverado - Fuel Mileage not near estimates

2014 Silverado - Fuel Mileage not near estimates

Postby SilverBullet71 [OP] » Nov 13 2013, 4:47pm

I recently purchased a 2014 Silverado Crew Cab 4x4 ZR1. One on the reasons for my purchase was the estimated fuel economy of 16/22. To date I have around 1,000 miles on it and have not seen anywhere near 16 mpg - more around 13.5. I commute about 30 miles round trip each day with 80% being highway driving. Am I missing something here? Any thoughts on why my mileage is so low?
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby JSDelaware » Nov 14 2013, 1:16am

You are breaking in a new truck on winter blend fuel,
but that still seems pretty low if 80% of your driving is highway.
Are you filling the tank and doing the math or looking at the fuel mileage avg in the truck?
The fuel mileage indicators in the vehicle almost always tell you that you are getting BETTER mileage than you
actually are,but maybe you have one that's showing worse.
That's about all I know to tell you,
other than, when I do mostly highway driving with my '12 4x4 with the 4.8 litre v8 I get around 19,
so your mileage definitely seems low.

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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby burls » Nov 14 2013, 1:57am

Where are you in the midwest? whats your driving style?

I have just under 300 miles on my Double cab Z-71 4x4 with 5.3 and 3.08 gears, my first tank was 17.68 which is pretty close to what the avg. mpg gauge was telling me, which was 18.1 I believe. Although I'm gonna wait for the next tank since the dealer filled it up and I'm unsure if they a) rest the trip and b) filled it all the way up, overfilled or under filled. My average commute is 75% 2 lane blacktop state hwy with few hills and the rest stop and go traffic. I try to stay under 70(usually lock cruise on at 65) and am a pretty conservative driver.

I always check my mpg on every fill up and keep a log. I'm so OCD about my mileage accuracy that I try to always fill up at the same gas station and the same pump.

For comparison, my previous trucks
12' X-cab Z71 4x4 5.3l 3.42 gears 18-19 summer blend/16.5-18 winter
11' X-cab Z71 4x4 5.3l 3.42 gears 18-20 summer blend/17-18 winter
05 X-cab Z71 4x4 5.3l 3.42 gears 19-22 summer blend/18-20 winter <I had 4 wheel hi engaged for 2 solid fuel tanks and they were both 18+. I miss that damn truck
04 reg cab short bed 5.3l 3.73 gears 16-17 summer blend/14-15 winter blend < I drove this truck way too hard
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14 Silverado 1500 LT Z-71 4x4 Double Cab
12 Silverado 1500 Z-71 4x4 Ext. Cab (Traded)
11 Silverado 1500 Z-71 4x4 Ext. Cab(Traded)
05 Silverado 1500 Z-71 Ext. Cab(Traded)
04 GMC Sierra 1500 SLE Reg Cab 2wd SB (SOLD)
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby tpollauf » Nov 18 2013, 10:43pm

I second the "wanting to know" the real midwest location (update profile more specifically please). Having owned my 2014 DC 5.3 w/ 3.42 gears 4x4 for just over three weeks I am pleased with the MPG numbers so far. In fact, I just took a small road trip down to Columbus and on my way back, heading north, I had a very strong tail wing pushing me (the one that brought us that nasty weather on Sunday) and got well over 30 actual MPG for the 150 or so miles :D The truck's current tank is resting between 1/4 &1/2 with 403 miles driven on this tank so far ;) and should get another 100 or so miles more (likely to be all city though)! My first tankful got me 17.1 MPG mixed driving. Will be curious as to what this "record" tanks MPG ends up being.
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby SilverBullet71 [OP] » Nov 18 2013, 11:32pm

Eastern Nebraska. Just filled up tank. Ran last tank dry and the mileage was 340. Still at over 70% highway driving.
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby OlafFG » Nov 18 2013, 11:37pm

Just curious, What is the chemical difference between the summer and winter blend of fuel? Can we add additives to help or is it the mixture that changes with the outside temp? Kinda feeling out of the loop on this one.
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby JSDelaware » Nov 18 2013, 11:58pm

I saw a post a while back by copperhead on this subject.
I believe he said butane is used as an additive in the winter blend fuel for better combustion in low temps, but this
decreases the mileage you will get.
can't remember the thread or I would say,
I have always noticed decreased mileage in the winter time also,
another thing is engines just aren't as efficient until they reach operating temp, nor are the trans or axles since
all the fluids are much thicker at say 30 degrees than 80 degrees.
So if you do mostly short trips like me it's a double whammy with the fuel blend and cold engine and drivetrain.

Joe
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby CKNSLS » Nov 19 2013, 12:03am

It's too early to make a determination. Put at least 5,000 miles on it before you start to worry. BTW- I assume your not using Ethanol.
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby Silvery13 » Nov 19 2013, 1:04am

SilverBullet71 wrote:Eastern Nebraska. Just filled up tank. Ran last tank dry and the mileage was 340. Still at over 70% highway driving.

What speed are you driving on the highway?
I'm not a member of the "good old boy" clan and I don't drink their kool aid.
Because severely hydrocracked Group III oils have properties very similar to Group IV oils, they are also called synthetic.
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Re: 2014 Silverado - Fuel Mileage not near estimates

Postby Chewy22 » Nov 20 2013, 4:51am

Something seems off. I have 5000 on my 5.3 3.42 crew cab. Mixed driving I was getting 18.5 70hwy/30city. Now getting 17.5 with the colder MT weather. Morning drive is worst and if the day warms up afternoon is better. Not as efficient as it gets colder. All highway with little wind 19-21 (75). Any kind of head wind is a killer 15.5-16.5.
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