2018 MINI Convertible Gas Tank Size & Fuel Capacity
Fuel tank capacity
11.6gal · 44 L
The 2018 MINI Convertible has a fuel tank capacity of 11.6 gallons (44 liters) on every trim.
A full tank is good for roughly 360–429 highway miles or 255–325 miles around town, going by the EPA ratings.
11.6 gal · Smaller than 95% of 2018 models we list.
2018 MINI Convertible fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
- no difference
All 3 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Cooper 2dr Convertible 1.5L 3cyl Turbo 6M · FWD MPG 28 / 37Range 325 / 429 mi | 1.5L 3cyl Turbo 6M | FWD | 11.6 gal44 L | 28 / 37 | 325 / 429 mi | |
| Cooper S 2dr Convertible 2.0L 4cyl Turbo 6M · FWD MPG 23 / 32Range 267 / 371 mi | 2.0L 4cyl Turbo 6M | FWD | 11.6 gal44 L | 23 / 32 | 267 / 371 mi | |
| John Cooper Works 2dr Convertible 2.0L 4cyl Turbo 6M · FWD MPG 22 / 31Range 255 / 360 mi | 2.0L 4cyl Turbo 6M | FWD | 11.6 gal44 L | 22 / 31 | 255 / 360 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 2018 MINI Convertible 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 32 MPG, a full 11.6-gallon tank covers about 371 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 11.6 | 429 | 325 |
| 3/4 | 8.7 | 322 | 244 |
| 1/2 | 5.8 | 215 | 162 |
| 1/4 | 2.9 | 107 | 81 |
| 1/8 | 1.5 | 54 | 41 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 469 gallons, roughly 40 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.
What it costs to fill up a 2018 MINI Convertible
$61.25 to fill the 11.6-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 |
|---|---|---|---|---|
| 11.6 gal | Premium | $5.28 | $61.25 | $45.94 |
By region, 11.6-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $57.19 |
| Midwest | $5.37 | $62.29 |
| Gulf CoastLowest | $4.57 | $53.01 |
| Rocky Mountain | $5.12 | $59.39 |
| West Coast | $6.08 | $70.53 |
| CaliforniaHighest | $6.36 | $73.78 |
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
- 11.6-gallon tank$61.25
- A year of driving (15,000 mi)$2,475
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
Convertible tank size in other years
The 2018 Convertible uses the same 11.6 gal tank as the 2017 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2023 Convertible | 11.6 gal | 441 mi |
| 2022 Convertible | 11.6 gal | 429 mi |
| 2021 Convertible | 11.6 gal | 429 mi |
| 2020 Convertible | 11.6 gal | 418 mi |
| 2019 Convertible | 11.6 gal | 429 mi |
| 2018 Convertible | 11.6 gal | 429 mi |
| 2017 Convertible | 11.6 gal | 429 mi |
Frequently asked questions
What is the fuel tank capacity of the 2018 MINI Convertible?
The 2018 MINI Convertible holds 11.6 gallons (44 liters) on every trim we list.
How many gallons and liters does the 2018 MINI Convertible gas tank hold?
The 2018 MINI Convertible tank holds 44 liters, or 11.6 gallons in US gallons.
How far can a 2018 MINI Convertible go on a full tank?
About 360–429 miles on the highway and 255–325 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 MINI Convertible go on a quarter tank?
About 107 highway miles or 81 in town from the 11.6-gallon tank, which has roughly 2.9 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 MINI Convertible take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 MINI Convertible?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 11.6-gallon tank from empty costs $61.25. It ranges from $53.01 in the Gulf Coast to $73.78 in California.
How much does a full tank of gas weigh in a 2018 MINI Convertible?
About 72 pounds for the 11.6-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings. 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.