2021 Lexus IS 350 Gas Tank Size & Fuel Capacity
Fuel tank capacity
17.4gal · 66 L
The 2021 Lexus IS 350 has a fuel tank capacity of 17.4 gallons (66 liters) on every trim.
A full tank is good for roughly 452–487 highway miles or 331–348 miles around town, going by the EPA ratings.
17.4 gal · Smaller than 55% of 2021 models we list.
2021 Lexus IS 350 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
- no difference
- Engine
- no difference
All 2 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| F SPORT 4dr Sedan 3.5L 6cyl 8A · RWD MPG 20 / 28Range 348 / 487 mi | 3.5L 6cyl 8A | RWD | 17.4 gal66 L | 20 / 28 | 348 / 487 mi | |
| F SPORT 4dr Sedan AWD 3.5L 6cyl 6A · AWD MPG 19 / 26Range 331 / 452 mi | 3.5L 6cyl 6A | AWD | 17.4 gal66 L | 19 / 26 | 331 / 452 mi | |
| No trim matches all of these filters. | ||||||
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 2021 Lexus IS 350 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 22 MPG, a full 17.4-gallon tank covers about 383 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 17.4 | 452 | 331 |
| 3/4 | 13.1 | 339 | 248 |
| 1/2 | 8.7 | 226 | 165 |
| 1/4 | 4.4 | 113 | 83 |
| 1/8 | 2.2 | 57 | 41 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 682 gallons, roughly 39 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.
- EPA combined
- 22–23 MPG
- Tailpipe CO2
- 385–407 g/mi
- EPA greenhouse score
- 4–5 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 Lexus IS 350
$91.87 to fill the 17.4-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 17.4 gal | Premium | $5.28 | $91.87 | $68.90 |
By region, 17.4-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $85.78 |
| Midwest | $5.37 | $93.44 |
| Gulf CoastLowest | $4.57 | $79.52 |
| Rocky Mountain | $5.12 | $89.09 |
| West Coast | $6.08 | $105.79 |
| CaliforniaHighest | $6.36 | $110.66 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 17.4-gallon tank$91.87
- A year of driving (15,000 mi)$3,600
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
IS 350 tank size in other years
The 2021 IS 350 uses the same 17.4 gal tank as every IS 350 since 2014.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 IS 350 | 17.4 gal | 487 mi |
| 2022 IS 350 | 17.4 gal | 487 mi |
| 2021 IS 350 | 17.4 gal | 487 mi |
| 2020 IS 350 | 17.4 gal | 487 mi |
| 2019 IS 350 | 17.4 gal | 487 mi |
| 2018 IS 350 | 17.4 gal | 487 mi |
| 2017 IS 350 | 17.4 gal | 487 mi |
| 2016 IS 350 | 17.4 gal | 487 mi |
2021 Lexus IS 350 vs similar 2021 sedans
The IS 350 has the largest tank of the six 2021 sedans compared here, 17.4 gallons against 15.9 for the Volvo S60.
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Lexus IS 350 | 17.4 gal | 487 mi |
| Volvo S60 | 15.9 gal | 541 mi |
| Acura TLX | 15.9 gal | 493 mi |
| Genesis G70 | 15.8 gal | 474 mi |
| BMW M3 | 15.6 gal | 359 mi |
| Audi S4 | 15.3 gal | 428 mi |
Other 2021 sedans of a similar size, one model per brand.
Frequently asked questions
What is the fuel tank capacity of the 2021 Lexus IS 350?
The 2021 Lexus IS 350 holds 17.4 gallons (66 liters) on every trim we list.
How many gallons and liters does the 2021 Lexus IS 350 gas tank hold?
The 2021 Lexus IS 350 tank holds 66 liters, or 17.4 gallons in US gallons.
Does AWD change the 2021 Lexus IS 350 gas tank?
No. RWD and AWD versions of the 2021 Lexus IS 350 use the same 17.4 gal tank.
How far can a 2021 Lexus IS 350 go on a full tank?
About 452–487 miles on the highway and 331–348 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 2021 Lexus IS 350 go on a quarter tank?
About 113 highway miles or 83 in town from the 17.4-gallon tank, which has roughly 4.4 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 Lexus IS 350 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 Lexus IS 350?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 17.4-gallon tank from empty costs $91.87. It ranges from $79.52 in the Gulf Coast to $110.66 in California.
How much does a full tank of gas weigh in a 2021 Lexus IS 350?
About 108 pounds for the 17.4-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 Lexus IS 350 have a bigger gas tank than the Volvo S60?
Yes. The 2021 Lexus IS 350 holds up to 17.4 gallons; the 2021 Volvo S60 holds up to 15.9.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.