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2010 Z71 Fuel Consumption

1842 Views 22 Replies 8 Participants Last post by  RayVoy
I just bought a 2010 Z71 Suburban with 123k miles. 3.08 rear end, six-speed tranny, and AFM.

We drove from Albany to Syracuse (150 miles each way) for my son's college visit.

We started out with a completely full tank from completely empty (it took just about 31 gallons), and I reset the trip odometer and average MPGs (was at 15.7).

There's a good upward elevation change going to Syracuse, we had an oblique headwind, and it was in the lower 20s. According to the computer, we got right around 15 MPGs on the way out.

I did not reset the computer, and when we got home the figure had risen to 16.2 mpg. We did hit about 5 miles of stop and go traffic. Gas gauge read half a tank when we got home.

I was expecting to get better mileage than this. My 01 with 205k, 4 speed, and no AFM gets the same.

The new truck has Firesrone Destination A/Ts; could this account for some of the difference? My old truck has Michelin x-radial LTs.

Anything else I need to look into? Thanks.
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Once upon a time when I bought my wife's hybrid, I asked around about the advertised 47 mpg. The sales guy said he was actually achieving 366 mpg in his, but he plugged it in morning and night and never took it on the freeway. 8 months after buying he was still on his first tank of gas. It's all in how you manipulate the conditions. He told me that MPG ratings listed on vehicles are achieved under the most strict and stringent conditions. Everything is perfect on test day, right down to the barometric pressure, humidity level, temperature, wind speed, vehicle speed, elevation change (there is none) That is how the manufacturers achieve the numbers that the average consumer never will. I have over 100K on my hybrid in 3 years. I have been on 2k mile trips where I have gotten as high as the advertised 47, and as low as 38. I have had a few 35 mile trips home that I averaged 62, and the same trip that has been as low as 36. I even had one 12 mile trip, mostly down hill in elevation, that I got 79.6 mpg. Headwind, season, idiot drivers, daytime, night time, it all plays into mileage. Your best average should be taken over a longer period of time and mileage, a few months and several thousand miles, to give you your true average. My best calculations on the hybrid over thousands of miles is 39.6. Ford adjusted their sticker average down to 42 about 6 months after I bought the car and gave me an $800 'I'm Sorry" check. If I take it easy and drive like an old man, I can keep the running average up around 44, but that's no fun! The 7.4L Burb is another story. No matter what I do, fully loaded or completely empty, towing or not, I can't get any better than 14, and usually no worse than 12. It's the nature of the beast, and I love it!
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