Fuel petrol cars
BSR recommends you to use at least EU 98 octane unleaded (≈US 93 octane), no matter if the car is tuned or not, and no matter what tuning stage you have.

• Cars with BSR Stage 3 or more require EU 98 (≈US 93) minimum.
• Cars with BSR Stage 1-2 can be run on EU 95 (≈US 90) if it’s permitted (see instruction book), but the result is increased fuel consumption and less power than indicated.

Diesel cars
Use high quality diesel.


Consumption
Objective measurements of fuel consumption have not been performed. In general an upgrade will give a small fuel consumption reduction as long as the turbo pressure is kept below original pressure, i.e. when the added effect of the tuning is not used. By using sport filters and full flow exhaust emission control systems there is less resistance and therefore the fuel consumption can be reduced with a few percentages.

The fuel consumption can increase as the turbo pressure rises higher than original level.