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MPG disapointment and ?

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Just curious what you think on this. 2011 Silverado, 6k miles on it now. Engine is 5.3 with active fuel management , rear end is 3:43. 18 inch tires

Sticker says It should get between 15-21 mpg. I’ve reset the computer a couple times to check and see if there are any differences in how I drive it. I’ve also checked it manually with pen and paper. Both are correct within an amount that is negligible. It averages 12-13mpg for every day driving (city and highway). Highway it was 16.2, that’s running on 94 for 2 hours from Alexandria to my home at speed limit of 70 with cruise control on.

Does this seam right? I happened to fill up next to an identical truck as mine last week and asked the guy what he got for mpg. Off the top of his head said 18-20. I asked if he drove pretty mild or got on it. He said he didn’t baby it at all and was more aggressive. So I asked him if he would look at what the computer said he was getting. It said 17 as an average. Now from what he told me he drives into the cities every day and that’s a combined average.

Now I know it’s a truck we don’t expect great mileage but 5 mpg difference between that truck and mine is a lot IMO. I’ve started driving a lot less aggressive to see if it mattered and it really hasn’t. Some may remember I posted my MPG after pulling my boat to Texas as 12 mpg averaging 65 mph which was great. But why would it stay in that mpg range with every day driving? Could the rear end ratio be the difference? I like the truck so don’t get me wrong but I’m about to ask GM if anything can be done.

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Doesn't it start gettting better mpg after X thousand miles? You might nothave hit the majic point yet. My bros gets in the 18-21 of easy driving, 16.5 towing a 18' boat.

Others know more than me. Good luck.

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