Bertone X1/9
22 MPG The 1989 Bertone X1/9 is EPA-rated at 22 MPG combined (20 city / 26 highway). Over 15,000 miles a year that is about 682 gallons, $2182 a year in fuel, or $0.145 per mile at $3.20/gal.
Across its full 1984–1989 run it averages 22 MPG, essentially flat across 6 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.114 | $1136 | $1705 | $2273 |
| $3.00/gal | $0.136 | $1364 | $2045 | $2727 |
| $3.20/gal | $0.145 | $1455 | $2182 | $2909 |
| $3.50/gal | $0.159 | $1591 | $2386 | $3182 |
| $4.00/gal | $0.182 | $1818 | $2727 | $3636 |
| $4.50/gal | $0.205 | $2045 | $3068 | $4091 |
| $5.00/gal | $0.227 | $2273 | $3409 | $4545 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 1989 | 22 MPG | 20 | 26 | $2850 | 404 | 1 |
| 1988 | 22 MPG | 20 | 26 | $2850 | 404 | 1 |
| 1987 | 22 MPG | 20 | 26 | $2850 | 404 | 1 |
| 1986 | 22 MPG | 20 | 26 | $2850 | 404 | 1 |
| 1985 | 22 MPG | 20 | 26 | $2850 | 404 | 1 |
| 1984 | 22 MPG | 20 | 26 | $2850 | 404 | 2 |
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.
How it compares in its class
Among the 105 two seaters models tracked here, the Bertone X1/9 ranks 28 on current figures, against a class average of 21.4 MPG.
Closest more-efficient alternatives in the same class: Lotus Elise/Exige (22.5), Porsche 718 Boxster (23), Porsche 718 Cayman (23), Porsche Boxster (23), Porsche Cayman (23).
Tailpipe CO₂ is rated at 404 grams per mile, which works out to roughly 6.1 tonnes a year at 15,000 miles.
Questions
What MPG does the Bertone X1/9 get?
The 1989 Bertone X1/9 is rated at 22 MPG combined by the EPA — 20 city and 26 highway. Across all 6 model years in the database it averages 22 MPG, ranging from 22 to 22 depending on year and trim.
How much does a Bertone X1/9 cost in fuel per year?
At 22 MPG and 15,000 miles a year, it burns about 682 gallons — roughly $2182 a year with fuel at $3.20 a gallon, or $0.145 per mile. The EPA's own published annual figure for the 1989 model is $2850.
Has the Bertone X1/9 become more efficient over time?
Barely. It sits at 22 MPG today against 22 in 1984 — essentially flat across 6 model years, with efficiency gains offset by weight and power creep.
Is the Bertone X1/9 efficient for its class?
It ranks 28 of 105 in the Two Seaters class on current figures, against a class average of 21.4 MPG. That is 0.6 better than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.