2018 Gmc C6 prices in the U.S.
The median pre-owned asking price for a 2018 Gmc C6 in the U.S. is $23,995 based on 35 pre-owned listings (of 37 total).
As of July 25, 2026, the median asking price for a used 2018 Gmc C6 in the U.S. is $23,995, based on 35 active dealer listings tracked by VinAssessment.
◷ Updated July 25, 2026 ▤ 37 active dealer listings, refreshed daily Methodology →
Typical: $21,143–$25,750 — the middle half of 37 asking prices
Why the wide range? Price depends mostly on configuration and mileage — see below. This spread covers the middle 96% of asking prices: we exclude the cheapest and priciest 2% (payment-priced ads, typos, salvage) so outliers don't distort it.
What moves the price on a 2018 Gmc C6
The $21,143–$25,750 typical range isn't randomness — one factor explains most of it:
Asking prices run about $25,598 at 60K–75K miles and fall to $18,500 over 105K miles — roughly $1,600 for every 10,000 miles.
Find your mileage and trim in the configurator below.
Configure the exact car
Modelled from 37 real asking prices, adjusted for mileage and location. Not a formal appraisal.
2018 Gmc C6: a fair price for your mileage
A 2018 Gmc C6 sheds roughly $1,600 for every 10,000 miles. Find your mileage below.
| Mileage ⓘ | Based on ⓘ | Fair price ⓘ | Typical range ⓘ |
|---|---|---|---|
| 60K–75K miles | 8 listings | $25,598 | $25K–$26K |
| 75K–90K miles | 6 listings | $24,388 | $24K–$25K |
| 90K–105K miles | 6 listings | $23,464 | $22K–$24K |
| Over 105K miles | 13 listings | $18,500 | $17K–$22K |
Same trim and condition assumed — mileage is the biggest lever after configuration.
Price trend
Average price is down $113 since June 11.
2018 Gmc C6 prices by state
| State | Typical price | Listed this year | Active now |
|---|---|---|---|
| Michigan | $18,690 | 6 | 6 Shop 2017–2019 nearby → |
Listed this year counts every 2018 Gmc C6 first listed in 2026 (sold and active), with currently active cars as a floor. Typical price is the median of each car's latest asking price — or the average of active listings where this-year data is thin.
Keep exploring C6 prices
2018 Gmc C6 · $23,177 typical · 37 listingsLive 2018 Gmc C6 listings, priced by VIN
Every VIN links to a full market report: decode, active listings and the local price band. Shop 2017–2019 Gmc C6 listings on VehiSales →.
More 2018 Gmc prices
Frequently asked questions
Why do 2018 Gmc C6 prices range from $15,999 to $30,157?
The spread comes down to configuration and mileage: higher-mileage, base-configuration examples sit near the low end, while low-mileage and premium configurations reach the top. Half of all listings fall between $21,143 and $25,750 — see the mileage and trim breakdowns above for where a specific vehicle lands.
How much should mileage change the price of a 2018 Gmc C6?
Expect roughly $1,600 less for every 10,000 miles on the odometer. A 60K-mile example should cost about $4,800 less than a 30K-mile one of the same trim — check the fair-price-by-mileage table above for your band.
How many 2018 Gmc C6 are for sale right now?
37 in total, nearly all pre-owned. Counts refresh daily from live dealer inventory.
How we calculate these prices
We track 37 active listings for this vehicle across dealer sites nationwide, updated every day. Average and median are computed from real asking prices on live listings. We exclude the top and bottom 2% of prices to remove data errors, salvage titles, and monthly-payment figures posted as if they were sale prices. Prices reflect dealer asking prices — not final sale prices — and exclude taxes, fees, and incentives. Trim and mileage move the price more than any other factor; see the breakdowns above.
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