2020 BMW M8 Gas Tank Size & Fuel Capacity
Fuel tank capacity
20.1gal · 76 L
The 2020 BMW M8 has a fuel tank capacity of 20.1 gallons (76 liters) on every trim.
A full tank is good for roughly 422 highway miles or 302 miles around town, going by the EPA ratings.
20.1 gal · Bigger than 69% of 2020 models we list.
Listed separately: 2020 BMW M8 Gran Coupe (20.1 gal).
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- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
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- Compared
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- FAQ
2020 BMW M8 fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| 2dr Convertible AWD 4.4L 8cyl Turbo 8A · AWD MPG 15 / 21Range 302 / 422 mi | 4.4L 8cyl Turbo 8A | AWD | 20.1 gal76 L | 15 / 21 | 302 / 422 mi | |
| 2dr Coupe AWD 4.4L 8cyl Turbo 8A · AWD MPG 15 / 21Range 302 / 422 mi | 4.4L 8cyl Turbo 8A | AWD | 20.1 gal76 L | 15 / 21 | 302 / 422 mi | |
| Competition 2dr Convertible AWD 4.4L 8cyl Turbo 8A · AWD MPG 15 / 21Range 302 / 422 mi | 4.4L 8cyl Turbo 8A | AWD | 20.1 gal76 L | 15 / 21 | 302 / 422 mi | |
| Competition 2dr Coupe AWD 4.4L 8cyl Turbo 8A · AWD MPG 15 / 21Range 302 / 422 mi | 4.4L 8cyl Turbo 8A | AWD | 20.1 gal76 L | 15 / 21 | 302 / 422 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 2020 BMW M8 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 17 MPG, a full 20.1-gallon tank covers about 342 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 20.1 | 422 | 302 |
| 3/4 | 15.1 | 317 | 226 |
| 1/2 | 10.1 | 211 | 151 |
| 1/4 | 5.0 | 106 | 75 |
| 1/8 | 2.5 | 53 | 38 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 882 gallons, roughly 44 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
- 17 MPG
- Tailpipe CO2
- 518 g/mi
- EPA greenhouse score
- 3 of 10
- Gas guzzler tax
- Yes
- Source
- EPA ratings
What it costs to fill up a 2020 BMW M8
$106.13 to fill the 20.1-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 |
|---|---|---|---|---|
| 20.1 gal | Premium | $5.28 | $106.13 | $79.60 |
By region, 20.1-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $99.09 |
| Midwest | $5.37 | $107.94 |
| Gulf CoastLowest | $4.57 | $91.86 |
| Rocky Mountain | $5.12 | $102.91 |
| West Coast | $6.08 | $122.21 |
| CaliforniaHighest | $6.36 | $127.84 |
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
- 20.1-gallon tank$106.13
- A year of driving (15,000 mi)$4,659
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
M8 tank size in other years
2020 is the first M8 model year we list.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2025 M8 | 20.1 gal | 442 mi |
| 2024 M8 | 20.1 gal | 442 mi |
| 2023 M8 | 20.1 gal | 422 mi |
| 2022 M8 | 20.1 gal | 422 mi |
| 2020 M8 | 20.1 gal | 422 mi |
2020 BMW M8 vs similar 2020 convertibles
The M8 has the largest tank of the three 2020 convertibles compared here, 20.1 gallons against 19.8 for the Mercedes-Benz SL-Class.
| 2020 model | Tank | Longest highway range |
|---|---|---|
| BMW M8 | 20.1 gal | 422 mi |
| Mercedes-Benz SL-Class | 19.8 gal | 554 mi |
| Audi S5 | 15.3 gal | 413 mi |
Other 2020 convertibles of a similar size, one model per brand.
2020 BMW M8 fuel system recalls
None of the 5 recalls NHTSA lists for the 2020 BMW M8 involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2020 BMW M8?
The 2020 BMW M8 holds 20.1 gallons (76 liters) on every trim we list.
How many gallons and liters does the 2020 BMW M8 gas tank hold?
The 2020 BMW M8 tank holds 76 liters, or 20.1 gallons in US gallons.
How far can a 2020 BMW M8 go on a full tank?
About 422 miles on the highway and 302 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 2020 BMW M8 go on a quarter tank?
About 106 highway miles or 75 in town from the 20.1-gallon tank, which has roughly 5.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2020 BMW M8 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2020 BMW M8?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 20.1-gallon tank from empty costs $106.13. It ranges from $91.86 in the Gulf Coast to $127.84 in California.
How much does a full tank of gas weigh in a 2020 BMW M8?
About 125 pounds for the 20.1-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2020 BMW M8 have a bigger gas tank than the Mercedes-Benz SL-Class?
Yes. The 2020 BMW M8 holds up to 20.1 gallons; the 2020 Mercedes-Benz SL-Class holds up to 19.8.
Has the 2020 BMW M8 had a fuel pump or fuel system recall?
No. None of the 5 recalls NHTSA lists for the 2020 BMW M8 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 (BMW 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.