On a 100 km mixed trip, the BMW 128ti and BMW Z4 sDrive30i have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.
What each kilometre costs, depending on your driving profile and how you charge. Annual projection and cumulative savings over 10 years.
| Profile | Split | AA · 128ti | BB · Z4 | Gap |
|---|---|---|---|---|
| City70 / 25 / 5 | 70 % city · 25 % road · 5 % motorway | 2,368 € | 2,238 € | 130 € · Z4 |
| Mixed30 / 50 / 20 | 30 % city · 50 % road · 20 % motorway | 2,165 € | 2,034 € | 130 € · Z4 |
| Long-distance10 / 40 / 50 | 10 % city · 40 % road · 50 % motorway | 2,012 € | 1,881 € | 130 € · Z4 |
Cumulative saving for the Z4 sDrive30i
Energy only. Excludes purchase, insurance, servicing, depreciation.
On a 100 km mixed trip, the BMW 128ti and BMW Z4 sDrive30i have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.
The BMW Z4 sDrive30i is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.