SMART forfour Operating Instructions Manual page 47

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On board instruments
The optimum engine speed ranges (rpm) are:
Driving off
Normal operation at constant speed
Brief periods of acceleration, e.g. when passing
1 40 Getting acquainted
Tachometer
The tachometer displays the engine
speed in units of 1000 rpm.
Driving in the optimum engine speed
range helps you to
save fuel.
take good care of the engine.
Petrol engines
1000 2000
2000 3000
3000 6300
>Important!
Change gear in good time and always pay
attention to the gear shift recommenda
tions indicated in your car's gear indi
cator.
Diesel engines
1000 2000
1800 3000
3000 4400