Is the $20,979 price on this 2018 GMC Sierra 1500 a good deal?

OAV rates this as a Great Deal because the asking price of $20,979 is below the typical market range for this vehicle.

What is the average price for a 2018 GMC Sierra 1500 in ME?

Based on 188 comparable listings in ME, the average asking price for a 2016-2020 GMC Sierra 1500 is $27,976, with prices ranging from $8,250 to $41,995.

How long does a 2018 GMC Sierra 1500 typically stay on dealer lots?

Comparable GMC Sierra 1500 listings in ME spend an average of 57 days on dealer lots.

Where is this 2018 GMC Sierra 1500 located?

This vehicle is listed in Thomaston, ME 04861. VIN: 3GTU2NEC8JG232340. Mileage: 120,879 miles.

No Photo Available

Vehicle Details

VIN3GTU2NEC8JG232340

TrimSLT

Exterior ColorWhite

Drivetrain4WD

Engine5.3L V8

TransmissionAutomatic

Fuel TypeUnleaded

Inventory Typeused

Days on Lot4

2018 GMC Sierra 1500

SLT

Unscored

$20,979120,879 mi

Thomaston, ME 04861

Is this 2018 GMC Sierra 1500 SLT a good deal?

OAV verdict: Unscored

Why: Listed at $20,979, comparable market range $25,894–$30,648, based on 5 comparable listings. Days on lot: 4 days (market average 57 days).

Market price position

$20,979 · $4,915 below market low

$25,894comparable$30,648

Regional range: $25,894 – $30,648
vs. market low: — $4,915 (19% below)
Comparable vehicles: 5

Market Retail Price (MRP™)

$28,271

This vehicle $20,979 · $7,292 (26%) below MRP

MRP™ is the midpoint of the comparable market range — the representative price the market is asking for similar vehicles. How MRP works.

True Retail Value (TRV™)

$26,332

This vehicle $20,979 · $5,353 (20%) below TRV

TRV™ is the average paid price for cars like this in the last 60 days (sold data through 2026-07-19) — an estimate, not an appraisal. How TRV works.

Demand-Verified· Backed by recent sales data

Similar vehicles recently sold in an estimated 13–57 days.

Market Breakdown

Local = comparable listings in the same metro. Regional = comparable listings across the broader state or multi-state region. Both ranges update continuously.

Local Range$25,894 – $26,995

Regional Range$25,894 – $30,648

Shepard Chrysler Dodge Jeep Ram

Thomaston, ME

OAV routes your inquiry; pricing, taxes, fees, and availability come from the dealer.

View all vehicles from shepard chrysler dodge jeep ram →

Request availability and out-the-door price

OAV will route your inquiry to Shepard Chrysler Dodge Jeep Ram for current availability of this 2018 GMC Sierra 1500 SLT and an out-the-door price quote (taxes, fees, addons included).

OAV routes your inquiry; pricing, taxes, fees, and availability come from the dealer.

About This 2018 GMC Sierra 1500

Listing updated: Jul 19, 2026

Listed by a franchise dealer in Thomaston, ME · On lot for 4 days · VIN verifiable at NHTSA

This used 2018 GMC Sierra 1500 SLT is listed at $20,979 by shepard chrysler dodge jeep ram in Thomaston, ME 04861. It has 120,879 miles on the odometer. The exterior color is White. It features a 4WD drivetrain with a 5.3L V8 engine and Automatic transmission.

OAV's AI-powered Price-to-Market analysis rates this vehicle as Unscored due to insufficient comparable data. Based on 5 similar vehicles in the Thomaston market, the estimated market range is $25,894 to $30,648. The local market range in ME is $25,894 to $26,995.

This vehicle has been on the lot for 4 days.

Analysis powered by OAV's patented inventory standardization technology (U.S. Patent No. 12,236,477).

Market context

This listing is part of OAV's broader Thomaston, ME trucks market analysis. OAV compares vehicles using local and regional price-to-market ranges, days-on-lot, comparable count, and demand signals where available.

How this deal is rated

OAV compares this 2018 GMC Sierra 1500 against similar vehicles currently available in the local and regional market — same make, model, and year range, filtered for comparable mileage. Based on where this listing falls in that comparable set, it is rated:

Great Deal — priced below the typical range for comparable vehicles.
Fair Price — priced within the expected range for comparable vehicles.
Overpriced — priced above the typical range for comparable vehicles.

Listings show OAV's PTM-derived deal quality and live market context. OAV-claimed dealers manage their listing profile and route buyer inquiries directly. Paid OAV partners surface additional verification signals.

How this listing is verified

This vehicle listing was aggregated from a franchise dealer in Thomaston, ME, one of 57,000+ U.S. dealerships in OAV's nationwide inventory network.The VIN 3GTU2NEC8JG232340 can be independently verified via the U.S. Department of Transportation's NHTSA VIN decoder, and safety recalls at NHTSA's recall database.

Vehicle attributes (year, make, model, trim, mileage, location) are standardized using OAV's patented methodology (U.S. Patent No. 12,236,477), which normalizes naming conventions and deduplicates cross-listed inventory across the dealership network. Listing data is updated continuously; Price-to-Market analysis uses comparable vehicles within the same geographic market.

2018 GMC Sierra 1500 Market in ME

Comparable Vehicles

188

Average Price

$27,976

Price Range

$8,250–$41,995

Avg Days on Lot

Based on 188 comparable 2016-2020 GMC Sierra 1500 listings in ME, the average asking price is $27,976. This listing at $20,979 is $6,997 below average (25% below market). Comparable prices in ME range from $8,250 to $41,995. Similar vehicles spend an average of 57 days on dealer lots in this market.