The 2018 Ram 1500 has a fuel tank capacity of 26.0 to 32.0 gallons (98–121 liters), depending on the trim. The most common size is 26.0 gallons, used on 72 trims.
A full tank is good for roughly 546–800 highway miles or 390–544 miles around town, going by the EPA ratings.
020 gal40 gal
32.0 gal · Bigger than 96% of 2018 models we list.
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 2018 Ram 1500 goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 19 MPG, a full 26.0-gallon tank covers about 494 miles.
Gauge
Gallons
Highway miles
City miles
Full
26.0
598
416
3/4
19.5
449
312
1/2
13.0
299
208
1/4
6.5
150
104
1/8
3.3
75
52
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 gallons, roughly 30 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
NHTSA lists 3 fuel-system recalls for the 2018 Ram 1500, out of 15 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Engine and engine coolingJun 8, 2023 · NHTSA 23V411000 · Chrysler (Fca Us, LLC) · 80,629 vehicles
Chrysler (FCA US, LLC) is recalling certain 2014-2019 Ram 1500 and 2014-2020 Jeep Grand Cherokee vehicles equipped with 3.0L Diesel engines. The crankshaft position sensor tone wheel may delaminate, causing the engine to lose its ability to synchronize the fuel injector pulses and cam shaft timing, possibly resulting in an engine stall.
Risk and remedy
Risk: An engine stall can increase the risk of a crash.
Remedy: Dealers will update the powertrain control module software to maintain vehicle propulsion, free of charge. Interim notification letters, notifying owners of the safety risk, were mailed August 3, 2023. Some owner notification letters were mailed October 31, 2023. The remaining owner notification letters will be mailed at a future date, anticipated July 2024. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLC's number for this recall is 66A. This recall is an expansion of recall 20V-475.
Chrysler (FCA US, LLC) is recalling certain 2014-2020 Jeep Grand Cherokee, and 2014-2019 Ram 1500 vehicles equipped with 3.0L diesel engines. A high pressure fuel pump (HPFP) failure may introduce internal debris into the fuel system, potentially resulting in fuel starvation.
Risk and remedy
Risk: Fuel starvation may result in an unexpected loss of drive power, increasing the risk of a crash.
Remedy: Dealers will replace the HPFP, and inspect and replace, if necessary, additional fuel system components, free of charge. Interim notification letters informing owners of the safety risk were mailed July 21, 2022. Owner notification letters for were mailed for Jeep Grand Cherokee owners starting January 11, 2024. Owner notification letters for Ram 1500 owners were mailed March 7, 2024. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLS's number for this recall is Z46.
Engine and engine cooling · Engine · DieselAug 13, 2020 · NHTSA 20V475000 · Chrysler (Fca Us Llc) · 58,016 vehicles
Chrysler (FCA US LLC) is recalling certain 2014-2018 Ram 1500 and 2014-2016 Jeep Grand Cherokee vehicles equipped with 3.0L diesel engines. The crankshaft position sensor tone wheel may delaminate causing the engine to lose its ability to synchronize the fuel injector pulses and cam shaft timing, possibly resulting in an engine stall.
Risk and remedy
Risk: An engine stall can increase the risk of a crash.
Remedy: FCA US will notify owners, and dealers will update the powertrain control module software to maintain vehicle propulsion by reading the camshaft position signal in the event that the crankshaft position signal is lost, free of charge. Owner notification letters were mailed on May 13, 2021. Owners may contact FCA US customer service at 1-800-853-2002. FCA US's number for this recall is W58.
What is the fuel tank capacity of the 2018 Ram 1500?
The 2018 Ram 1500 holds between 26.0 and 32.0 gallons, depending on the trim. 26.0 gallons is the usual size; the 32.0-gallon tank comes on the Big Horn 2dr Regular Cab 4WD LB (3.6L 6cyl 8A).
How many gallons and liters does the 2018 Ram 1500 gas tank hold?
The 2018 Ram 1500 tank holds 98–121 liters, or 26.0–32.0 gallons in US gallons.
Which 2018 Ram 1500 has the biggest gas tank?
The 32.0-gallon tank is on the Big Horn 2dr Regular Cab 4WD LB, Big Horn 2dr Regular Cab LB, Limited 4dr Crew Cab 4WD 5.6 ft SB and 13 other trims. The smallest tank, 26.0 gallons, is on the Big Horn 2dr Regular Cab 4WD SB.
Does the 2018 Ram 1500 tank change with the powertrain?
No. 4WD and RWD versions of the 2018 Ram 1500 use the same 26.0–32.0 gal tank.
How far can a 2018 Ram 1500 go on a full tank?
About 546–800 miles on the highway and 390–544 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 2018 Ram 1500 go on a quarter tank?
About 150 highway miles or 104 in town from the 26.0-gallon tank, which has roughly 6.5 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Ram 1500 take?
Flex-fuel (unleaded/E85), or Regular unleaded, or Diesel fuel, depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 Ram 1500?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 26.0-gallon tank from empty costs $111.02. It ranges from $96.20 in the Gulf Coast to $153.14 in California.
How much does a full tank of gas weigh in a 2018 Ram 1500?
About 198 pounds for the 32.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Has the 2018 Ram 1500 had a fuel pump or fuel system recall?
Yes. NHTSA lists 3 fuel-system recalls for the 2018 Ram 1500: 23V411000 (engine and engine cooling); 22V406000 (delivery · fuel pump); 20V475000 (engine and engine cooling · engine · diesel). Check your VIN at nhtsa.gov/recalls to see if your car is affected.
Sources
Tank sizes: manufacturer-rated capacities from US-market specifications, cross-checked against a second spec database. Updated October 2026.
MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.