smart fortwo electric drive convertible
What it costs to keep fuelled
$471a year, fuel only
The 2018 smart fortwo electric drive convertible is EPA-rated at 102 MPGe combined (112 city / 91 highway). Over 15,000 miles a year that is about 147 gallons, $471 a year in fuel, or $0.031 per mile at $3.20/gal.
Across its full 2013–2018 run it averages 105.3 MPGe, falling by 5 MPGe over 6 model years.
The band is how far one gallon-equivalent of energy carries it: 102 of the 120 MPGe this scale runs to. The square tick is the two seaters average, 20.6.
- Fuel, per year
- $471 at 15,000 mi
- Per mile
- $0.031
- Per kilometre
- $0.019
- Gallon-equivalents/yr
- 147
1 mile = 1.609344 km · fuel at $3.20/gal, fixed JUL 2026
MPGe — not a fuel billSOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
How this is worked out
- Start from the EPA combined figure for the model year — a laboratory test cycle run to a fixed procedure, not a road result. Where a year sold several engines or drivetrains, the trims are averaged and the trim count is printed beside the row so you can see how much averaging is behind it.
- Fix a pump price. This site keeps one reference price, $3.20 a US gallon, fixed JUL 2026 and printed next to every dollar figure it produces. It is an assumption with a date on it, not a quote — put your own price in.
- Fix an annual distance. Every annual figure on this site uses 15,000 miles a year, roughly the US average. A cost per year with no stated distance is not a number, it is a mood.
- Divide distance by economy for gallons, multiply by price for the year's fuel, divide price by economy for one mile. The per-kilometre line is that last figure divided by 1.609344 — the same money, in the unit most of the world drives in.
- Stop there. No depreciation, no tyres, no insurance, no servicing. This is the fuel line of the ledger and it is labelled as one; depreciation usually dwarfs everything on it.
gallons/yr = miles/yr ÷ MPG fuel $/yr = gallons/yr × $/gal cost $/mi = $/gal ÷ MPG cost $/km = cost $/mi ÷ 1.609344
The full method, the licence note, and what a test figure cannot tell you →
Re-run the ledger at another pump price
Every line above rests on one pump price. Here is the same entry re-costed at six others, because the price is the part that changes while the test sheet stays put.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.025 | $245 | $368 | $490 |
| $3.00/gal | $0.029 | $294 | $441 | $588 |
| $3.20/gal | $0.031 | $314 | $471 | $627 |
| $3.50/gal | $0.034 | $343 | $515 | $686 |
| $4.00/gal | $0.039 | $392 | $588 | $784 |
| $4.50/gal | $0.044 | $441 | $662 | $882 |
| $5.00/gal | $0.049 | $490 | $735 | $980 |
This is an electric vehicle, so the EPA rates it in MPGe — the distance it travels on the energy equivalent of a gallon of petrol. The dollar figures above are a petrol-equivalent illustration only; charging at home is billed per kWh and is normally far cheaper. Treat the MPGe as an efficiency comparison, not a fuel bill.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
The whole service history, sheet by sheet
6 model years on file. Read down the combined column: a nameplate that got heavier shows it here long before any brochure admits it.
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2018 | 102 MPGe | 112 | 91 | $750 | — | 1 |
| 2017 | 102 MPGe | 112 | 91 | $750 | — | 1 |
| 2016 | 107 MPGe | 122 | 93 | $700 | — | 1 |
| 2015 | 107 MPGe | 122 | 93 | $700 | — | 1 |
| 2014 | 107 MPGe | 122 | 93 | $700 | — | 1 |
| 2013 | 107 MPGe | 122 | 93 | $700 | — | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Marked against the rest of the two seaters bay
Among the 105 two seaters models tracked here, the smart fortwo electric drive convertible ranks 2 on current figures, against a class average of 20.6 MPGe — the square tick on the gauge above.
Closest more-efficient alternatives in the same class: smart fortwo electric drive coupe (108).
Questions asked across the counter
What MPG does the smart fortwo electric drive convertible get?
The 2018 smart fortwo electric drive convertible is rated at 102 MPGe combined by the EPA — 112 city and 91 highway. Across all 6 model years in the database it averages 105.3 MPGe, ranging from 102 to 107 depending on year and trim.
How much does a smart fortwo electric drive convertible cost in fuel per year?
At 102 MPGe and 15,000 miles a year, it burns about 147 gallons — roughly $471 a year with fuel at $3.20 a gallon, or $0.031 per mile. The EPA's own published annual figure for the 2018 model is $750.
Has the smart fortwo electric drive convertible become more efficient over time?
No — it has actually gone backwards, from 107 MPGe in 2013 to 102 in 2018. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the smart fortwo electric drive convertible efficient for its class?
It ranks 2 of 105 in the Two Seaters class on current figures, against a class average of 20.6 MPGe. That is 81.4 better than typical for the class.
Pull another logbook off the same shelf
Same class, nearest economy first — the ones a buyer is genuinely choosing between.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Cost per mile, per kilometre and per year are computed at a reference price of $3.20 a gallon over 15,000 miles, fixed JUL 2026 — set your own pump price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.
