Gallonly
Menu

Theme
2018 GMC Sierra 1500 SLT (K2XX)
Shown: 2018 GMC Sierra 1500 SLT (K2XX). Photo: Kevauto, CC BY-SA 4.0, via Wikimedia Commons
  • Newest year: 2018
  • Gas
  • Hybrid
  • Standard pickups

2014-2018 GMC Sierra MPG & Fuel Cost

5 model years · 17–20 MPG combined

20 MPG
Combined
18 MPG
City
24 MPG
Highway
Annual fuel cost · C15 4.3L 6-cyl RWD
$3,290

15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)

Cheaper to fuel than 8 of 10 standard pickup configurations, MY2018. Ranked against all rated configurations, not sales-weighted.

Previous generation: 2007-2013 Next generation: 2019-2026

2014-2018 GMC Sierra at a glance

The 2014-2018 GMC Sierra covers 5 model years in the EPA database (62 configurations in all), rated 17–20 MPG combined. The newest model year, 2018, costs about $3,290 a year to fuel for its most efficient version, the C15 4.3L 6-cyl RWD (20 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). Powertrains over the years: gas and hybrid. EPA changed the ratings in 2015, 2016, 2017 and 2018.

2014-2018 GMC Sierra by model year

2014-2018 GMC Sierra: EPA combined rating and yearly fuel cost for each model year
Model yearPowertrainsCombined$/yrEPA ratings
2018 Gas, Hybrid 17–20 MPG $3,290–$4,740 Ratings changed
2017 Gas, Hybrid 17–20 MPG $3,290–$3,920 Ratings changed
2016 Gas, Hybrid 17–20 MPG $3,290–$3,840 Ratings changed
2015 Gas 17–20 MPG $3,290–$3,840 Ratings changed
2014 Gas 17–20 MPG $3,300–$3,940 First year

What the 2018 C15 4.3L 6-cyl RWD costs to drive

Per month

$274

$3,290 a year ÷ 12

Per 25 miles

$5.48

Per 100 miles

$21.93

Five years

$16,450

5 × the yearly cost, prices held at today's level

vs the standard pickup median

$340less a year

Class median $3,630 a year, MY2018

Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).

2018 GMC Sierra MPG

Versus 2017: The most efficient configuration stays at 20 MPG. Its annual cost stays at $3,290.

Gas · 4.3L, 5.3L, 6.2L
Combined
17–20 MPG
Per year
$3,290–$4,740
See gas configurations
Hybrid · 5.3L
Combined
18–20 MPG
Per year
$3,290–$3,610
See hybrid configurations

Gas configurations (12)

2018 GMC Sierra gas configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
C15 4.3L 6-cyl (Most efficient) 4.3L 6-cyl RWD 18 24 20 $3,290
K15 4.3L 6-cyl 4.3L 6-cyl 4WD 17 22 19 $3,480
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,490
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,490
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,590
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,590
C15 5.3L 8-cyl RWD Automatic 8-spd 5.3L 8-cyl RWD 16 22 18 $3,640
K15 5.3L 8-cyl 4WD Automatic 8-spd 5.3L 8-cyl 4WD 15 20 17 $3,800
C15 Cab Chassis 5.3L 8-cyl RWD 15 20 17 $3,840
K15 Cab Chassis 5.3L 8-cyl 4WD 15 19 17 $3,840
Show 2 more configurations
2018 GMC Sierra gas configurations: EPA ratings and annual cost (+2)
TrimEngineDriveCityHwyComb.$/yr
C15 6.2L 8-cyl6.2L 8-cylRWD152117$4,680
K15 6.2L 8-cyl6.2L 8-cyl4WD152017$4,740

2 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).

Flex-fuel (E85) configurations are costed on gasoline, not E85.

Hybrid configurations (2)

2018 GMC Sierra hybrid configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
15 Hybrid 5.3L 8-cyl RWD (Most efficient) 5.3L 8-cyl RWD 18 24 20 $3,290
15 Hybrid 5.3L 8-cyl 4WD 5.3L 8-cyl 4WD 16 21 18 $3,610

2017 GMC Sierra MPG

17–20 MPG · $3,290–$3,920/yr

Versus 2016: The most efficient configuration stays at 20 MPG. Its annual cost goes from $3,300 to $3,290, $10 less.

Gas · 4.3L, 5.3L, 6.2L
Combined
17–20 MPG
Per year
$3,290–$3,920
See gas configurations
Hybrid · 5.3L
Combined
18–20 MPG
Per year
$3,290–$3,600
See hybrid configurations

Gas configurations (12)

2017 GMC Sierra gas configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
C15 4.3L 6-cyl (Most efficient) 4.3L 6-cyl RWD 18 24 20 $3,290
K15 4.3L 6-cyl 4.3L 6-cyl 4WD 17 22 19 $3,480
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,500
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,520
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,620
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,640
Show 2 more configurations
2017 GMC Sierra gas configurations: EPA ratings and annual cost (+6)
TrimEngineDriveCityHwyComb.$/yr
C15 5.3L 8-cyl RWD Automatic 8-spd5.3L 8-cylRWD162218$3,650
C15 6.2L 8-cyl6.2L 8-cylRWD152117$3,770
K15 Cab Chassis5.3L 8-cyl4WD151917$3,840
C15 Cab Chassis5.3L 8-cylRWD152017$3,840
K15 6.2L 8-cyl6.2L 8-cyl4WD152017$3,900
K15 5.3L 8-cyl 4WD Automatic 8-spd5.3L 8-cyl4WD152017$3,920

Flex-fuel (E85) configurations are costed on gasoline, not E85.

Hybrid configurations (2)

2017 GMC Sierra hybrid configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
15 Hybrid 5.3L 8-cyl RWD (Most efficient) 5.3L 8-cyl RWD 18 24 20 $3,290
15 Hybrid 5.3L 8-cyl 4WD 5.3L 8-cyl 4WD 16 21 18 $3,600

2016 GMC Sierra MPG

17–20 MPG · $3,290–$3,840/yr

Versus 2015: The most efficient configuration stays at 20 MPG. Its annual cost goes from $3,290 to $3,300, $10 more.

Gas · 4.3L, 5.3L, 6.2L
Combined
17–20 MPG
Per year
$3,300–$3,840
See gas configurations
Hybrid · 5.3L
Combined
18–20 MPG
Per year
$3,290–$3,600
See hybrid configurations

Gas configurations (12)

2016 GMC Sierra gas configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
C15 4.3L 6-cyl (Most efficient) 4.3L 6-cyl RWD 18 23 20 $3,300
K15 4.3L 6-cyl 4.3L 6-cyl 4WD 17 22 19 $3,490
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,520
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,530
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,620
C15 5.3L 8-cyl RWD Automatic 8-spd 5.3L 8-cyl RWD 16 22 18 $3,630
Show 2 more configurations
2016 GMC Sierra gas configurations: EPA ratings and annual cost (+6)
TrimEngineDriveCityHwyComb.$/yr
K15 5.3L 8-cyl 4WD Automatic 6-spd5.3L 8-cyl4WD162218$3,630
C15 6.2L 8-cyl6.2L 8-cylRWD152117$3,770
K15 6.2L 8-cyl6.2L 8-cyl4WD152117$3,820
K15 5.3L 8-cyl 4WD Automatic 8-spd5.3L 8-cyl4WD152117$3,830
C15 Cab Chassis5.3L 8-cylRWD152017$3,840
K15 Cab Chassis5.3L 8-cyl4WD151917$3,840

Flex-fuel (E85) configurations are costed on gasoline, not E85.

Hybrid configurations (2)

2016 GMC Sierra hybrid configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
15 Hybrid 5.3L 8-cyl RWD (Most efficient) 5.3L 8-cyl RWD 18 24 20 $3,290
15 Hybrid 5.3L 8-cyl 4WD 5.3L 8-cyl 4WD 16 21 18 $3,600

2015 GMC Sierra MPG

17–20 MPG · $3,290–$3,840/yr

Versus 2014: The most efficient configuration stays at 20 MPG. Its annual cost goes from $3,300 to $3,290, $10 less.

Gas · 4.3L, 5.3L, 6.2L
Combined
17–20 MPG
Per year
$3,290–$3,840

Gas configurations (14)

2015 GMC Sierra gas configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
C15 4.3L 6-cyl (Most efficient) 4.3L 6-cyl RWD 18 24 20 $3,290
K15 4.3L 6-cyl 4.3L 6-cyl 4WD 17 22 19 $3,480
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,520
C15 5.3L 8-cyl RWD Automatic 6-spd 5.3L 8-cyl RWD 16 23 19 $3,520
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,600
K15 5.3L 8-cyl 4WD Automatic 6-spd 5.3L 8-cyl 4WD 16 22 18 $3,610
Show 4 more configurations
2015 GMC Sierra gas configurations: EPA ratings and annual cost (+8)
TrimEngineDriveCityHwyComb.$/yr
C15 Cab Chassis 4.3L 6-cyl4.3L 6-cylRWD162118$3,630
K15 Cab Chassis 4.3L 6-cyl4.3L 6-cyl4WD162018$3,630
C15 6.2L 8-cyl6.2L 8-cylRWD152117$3,780
K15 6.2L 8-cyl6.2L 8-cyl4WD152117$3,820
C15 Cab Chassis 5.3L 8-cyl RWD Automatic 6-spd5.3L 8-cylRWD152017$3,840
C15 Cab Chassis 5.3L 8-cyl RWD Automatic 6-spd5.3L 8-cylRWD152017$3,840
K15 Cab Chassis 5.3L 8-cyl 4WD Automatic 6-spd5.3L 8-cyl4WD151917$3,840
K15 Cab Chassis 5.3L 8-cyl 4WD Automatic 6-spd5.3L 8-cyl4WD151917$3,840

Flex-fuel (E85) configurations are costed on gasoline, not E85.

2014 GMC Sierra MPG

17–20 MPG · $3,300–$3,940/yr
Gas · 4.3L, 5.3L, 6.2L
Combined
17–20 MPG
Per year
$3,300–$3,940

Gas configurations (6)

2014 GMC Sierra gas configurations: EPA ratings and annual cost
TrimEngineDriveCityHwyComb.$/yr
C15 4.3L 6-cyl (Most efficient) 4.3L 6-cyl RWD 18 23 20 $3,300
K15 4.3L 6-cyl 4.3L 6-cyl 4WD 17 22 19 $3,480
C15 5.3L 8-cyl 5.3L 8-cyl RWD 16 23 19 $3,500
K15 5.3L 8-cyl 5.3L 8-cyl 4WD 16 22 18 $3,600
C15 6.2L 8-cyl 6.2L 8-cyl RWD 15 21 17 $3,890
K15 6.2L 8-cyl 6.2L 8-cyl 4WD 14 20 17 $3,940

Flex-fuel (E85) configurations are costed on gasoline, not E85.

Fuel cost by state

Yearly cost of the C15 4.3L 6-cyl RWD: $4,480 in California and $2,870 in Texas, a $1,610 difference.

Gasoline prices: California: California state average; Washington: Washington state average; New York: New York state average; Florida: Florida state average; Texas: Texas state average (Sep 2026).
Fuel cost in every state

Similar cars

Closest combined MPG among MY2018 standard pickup models.

2016 Chevrolet Silverado 1500 WT (K2XX)

2018 Chevrolet Silverado

20 MPG · $3,290/yr
2017 Ram 1500 Express Crew Cab (DS)

2018 Ram 1500

20 MPG · $3,310/yr
2020 Ford F-150 XLT SuperCrew 4x4 (13th gen)

2018 Ford F-150

22 MPG · $2,910/yr
2017 Honda Ridgeline

2018 Honda Ridgeline

22 MPG · $3,030/yr
EPA ratings: fueleconomy.gov file of Sep 29, 2026 · Prices: EIA regular gasoline, U.S. average, Sep 2026 ($4.36/gal) · 15,000 mi/yr, 55% city / 45% highway · How we calculate

Generations

All GMC Sierra years All GMC models

Frequently asked questions

What gas mileage does the 2014-2018 GMC Sierra get?

EPA rates the 2014-2018 GMC Sierra at 17–20 MPG combined across 62 configurations and 5 model years. The most efficient version, the 2018 C15 4.3L 6-cyl RWD, is rated 20 MPG (18 city, 24 highway). By powertrain: Gas: 17–20 MPG; Hybrid: 18–20 MPG.

Which years had the best MPG in the 2014-2018 GMC Sierra?

Every model year of the 2014-2018 GMC Sierra tops out at 20 MPG combined, so no year is better than another.

Did EPA ratings change during the 2014-2018 GMC Sierra?

Yes. Ratings changed in 2015, 2016, 2017 and 2018.

How does the 2014-2018 GMC Sierra compare with the previous generation?

The previous generation (2007-2013 GMC Sierra) is rated 14–22 MPG combined and costs $2,970–$5,740 a year to fuel; the 2014-2018 model is rated 17–20 MPG and costs $3,290–$4,740 a year.

How much does it cost to fuel a 2018 GMC Sierra per year?

Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the C15 4.3L 6-cyl RWD costs about $3,290 a year. Across all 14 configurations the cost runs $3,290–$4,740 a year. That is a $1,450 difference between the cheapest and the costliest configuration.

How much does it cost to drive a 2018 GMC Sierra 100 miles?

About $21.93 per 100 miles for the C15 4.3L 6-cyl RWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $21.93 and $31.60 across all configurations. That is the annual cost over 15,000 miles divided by 150.

How does the 2018 GMC Sierra compare with other standard pickup configurations?

The C15 4.3L 6-cyl RWD costs about $3,290 a year to fuel, $340 less than the class median of $3,630, and less than 8 of 10 standard pickup configurations. The comparison covers all 85 rated standard pickup configurations for MY2018, not weighted by sales.

Is the 2018 GMC Sierra hybrid cheaper to fuel than the gas version?

About the same. The best hybrid (15 Hybrid 5.3L 8-cyl RWD) is rated 20 MPG against 20 MPG for the best gas version (C15 4.3L 6-cyl RWD), and both cost $3,290 a year at regular gasoline $4.36/gal (U.S. average, Sep 2026).

Is the 2018 GMC Sierra different from the 2017 model?

The most efficient configuration stays at 20 MPG. Its annual cost stays at $3,290. EPA lists 14 configurations for 2018 against 14 configurations for 2017. See the 2017 GMC Sierra for that year.