2015 Buick LaCrosse Gas Tank Size & Fuel Capacity
Fuel tank capacity
16.6–19.5gal · 63–74 L
The 2015 Buick LaCrosse has a fuel tank capacity of 16.6 to 19.5 gallons (63–74 liters), depending on the trim. The most common size is 18.5 gallons, used on 3 trims.
A full tank is good for roughly 507–581 highway miles or 332–398 miles around town, going by the EPA ratings.
19.5 gal · Bigger than 60% of 2015 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- Pump & gauge parts
- FAQ
2015 Buick LaCrosse fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Powertrain
- Drive
- Engine
All 7 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| 4dr Sedan 2.4L 4cyl mild hybrid 6A · FWD · Regular MPG 24 / 35Range 398 / 581 mi | 2.4L 4cyl mild hybrid 6A | FWD | 16.6 gal63 L | Regular | 24 / 35 | 398 / 581 mi |
| Leather Group 4dr Sedan 2.4L 4cyl mild hybrid 6A · FWD · Regular MPG 24 / 35Range 398 / 581 mi | 2.4L 4cyl mild hybrid 6A | FWD | 16.6 gal63 L | Regular | 24 / 35 | 398 / 581 mi |
| 1SV 4dr Sedan 3.6L 6cyl 6A · FWD · Flex-fuel (gas or E85) MPG 18 / 28Range 333 / 518 mi | 3.6L 6cyl 6A Flex-fuel | FWD | 18.5 gal70 L | Flex-fuelgas or E85 | 18 / 28 | 333 / 518 mi |
| Premium I Group 4dr Sedan 3.6L 6cyl 6A · FWD · Flex-fuel (gas or E85) MPG 18 / 28Range 333 / 518 mi | 3.6L 6cyl 6A Flex-fuel | FWD | 18.5 gal70 L | Flex-fuelgas or E85 | 18 / 28 | 333 / 518 mi |
| Premium II Group 4dr Sedan 3.6L 6cyl 6A · FWD · Flex-fuel (gas or E85) MPG 18 / 28Range 333 / 518 mi | 3.6L 6cyl 6A Flex-fuel | FWD | 18.5 gal70 L | Flex-fuelgas or E85 | 18 / 28 | 333 / 518 mi |
| Leather Group 4dr Sedan AWD 3.6L 6cyl 6A · AWD · Flex-fuel (gas or E85) MPG 17 / 26Range 332 / 507 mi | 3.6L 6cyl 6A Flex-fuel | AWD | 19.5 gal74 L | Flex-fuelgas or E85 | 17 / 26 | 332 / 507 mi |
| Premium I Group 4dr Sedan AWD 3.6L 6cyl 6A · AWD · Flex-fuel (gas or E85) MPG 17 / 26Range 332 / 507 mi | 3.6L 6cyl 6A Flex-fuel | AWD | 19.5 gal74 L | Flex-fuelgas or E85 | 17 / 26 | 332 / 507 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 2015 Buick LaCrosse 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 21 MPG, a full 18.5-gallon tank covers about 389 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 18.5 | 518 | 333 |
| 3/4 | 13.9 | 389 | 250 |
| 1/2 | 9.3 | 259 | 167 |
| 1/4 | 4.6 | 130 | 83 |
| 1/8 | 2.3 | 65 | 42 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 714 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
- 20–21 MPG
- Tailpipe CO2
- 419–444 g/mi
- EPA greenhouse score
- 5 of 10
- Source
- EPA ratings
What it costs to fill up a 2015 Buick LaCrosse
$78.99 to fill the 18.5-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 16.6 gal | Regular | $4.27 | $70.88 | $53.16 |
| 18.5 gal | Regular | $4.27 | $78.99 | $59.25 |
| 19.5 gal | Regular | $4.27 | $83.26 | $62.45 |
| 19.5 gal | E85 (flex-fuel trims) | $3.31 | $64.55 | $48.41 |
By region, 18.5-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $74.37 |
| Midwest | $4.27 | $78.99 |
| Gulf CoastLowest | $3.70 | $68.45 |
| Rocky Mountain | $4.46 | $82.51 |
| West Coast | $5.42 | $100.27 |
| CaliforniaHighest | $5.89 | $108.96 |
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
- 16.6-gallon tank$70.88
- 18.5-gallon tank$78.99
- 19.5-gallon tank$83.26
- A year of driving (15,000 mi)$3,050
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
LaCrosse tank size in other years
The tank changed for 2015: 16.6–19.5 gal, up from 15.8–19.0 gal on the 2014 LaCrosse.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2019 LaCrosse | 15.8–16.2 gal | 553 mi |
| 2018 LaCrosse | 15.8–16.2 gal | 553 mi |
| 2017 LaCrosse | 15.8–16.2 gal | 490 mi |
| 2016 LaCrosse | 18.5–19.5 gal | 546 mi |
| 2015 LaCrosse | 16.6–19.5 gal | 581 mi |
| 2014 LaCrosse | 15.8–19.0 gal | 553 mi |
| 2013 LaCrosse | 15.8–19.0 gal | 569 mi |
| 2012 LaCrosse | 15.7–19.0 gal | 550 mi |
| 2011 LaCrosse | 18.4–19.5 gal | 552 mi |
| 2010 LaCrosse | 18.4–19.5 gal | 552 mi |
2015 Buick LaCrosse vs similar 2015 sedans
The LaCrosse has the largest tank of the five 2015 sedans compared here, 19.5 gallons against 18.5 for the Subaru Legacy.
| 2015 model | Tank | Longest highway range |
|---|---|---|
| Buick LaCrosse | 16.6–19.5 gal | 581 mi |
| Subaru Legacy | 18.5 gal | 666 mi |
| Toyota Avalon Hybrid | 17.0 gal | 663 mi |
| Honda Accord Hybrid | 15.8 gal | 711 mi |
| Ford Fusion Energi | 14.0 gal | 504 mi |
Other 2015 sedans of a similar size, one model per brand.
2015 Buick LaCrosse fuel system recalls
None of the 3 recalls NHTSA lists for the 2015 Buick LaCrosse involve the fuel system.
2015 Buick LaCrosse fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2015 Buick LaCrosse, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2015 Buick LaCrosse?
The 2015 Buick LaCrosse holds between 16.6 and 19.5 gallons, depending on the trim. 18.5 gallons is the usual size; the 19.5-gallon tank comes on the Leather Group 4dr Sedan AWD (3.6L 6cyl 6A).
How many gallons and liters does the 2015 Buick LaCrosse gas tank hold?
The 2015 Buick LaCrosse tank holds 63–74 liters, or 16.6–19.5 gallons in US gallons.
Which 2015 Buick LaCrosse has the biggest gas tank?
The 19.5-gallon tank is on the Leather Group 4dr Sedan AWD, Premium I Group 4dr Sedan AWD. The smallest tank, 16.6 gallons, is on the 4dr Sedan.
Does the 2015 Buick LaCrosse tank change with the powertrain?
Yes. Gas: 16.6 gal; Flex-fuel (E85): 18.5–19.5 gal.
Does AWD change the 2015 Buick LaCrosse gas tank?
Yes. FWD: 16.6–18.5 gal; AWD: 19.5 gal.
How far can a 2015 Buick LaCrosse go on a full tank?
About 507–581 miles on the highway and 332–398 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 2015 Buick LaCrosse go on a quarter tank?
About 130 highway miles or 83 in town from the 18.5-gallon tank, which has roughly 4.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2015 Buick LaCrosse take?
Flex-fuel (unleaded/E85), or Regular unleaded, depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2015 Buick LaCrosse?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.5-gallon tank from empty costs $78.99. It ranges from $68.45 in the Gulf Coast to $108.96 in California.
How much does a full tank of gas weigh in a 2015 Buick LaCrosse?
About 121 pounds for the 19.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2015 Buick LaCrosse have a bigger gas tank than the Ford Fusion Energi?
Yes. The 2015 Buick LaCrosse holds up to 19.5 gallons; the 2015 Ford Fusion Energi holds up to 14.0.
Has the 2015 Buick LaCrosse had a fuel pump or fuel system recall?
No. None of the 3 recalls NHTSA lists for the 2015 Buick LaCrosse involve the fuel system.
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).
- Recalls: NHTSA recall database (Buick fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.