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The Volvo S40 functions well on regular unleaded gasoline with an octane rating of 87. However, it can also utilize 91 octane or higher for enhanced performance. Opting for premium fuel will not only improve engine strength but also prolong the lifespan of various vehicle components, notably the fuel filter. With a fuel tank capacity of 15.9 US gallons, the MPG rating for this vehicle stands at 21 city and 30 highway. While the S40 may not offer the best fuel efficiency in terms of range, it still performs decently in this aspect.
The Volvo S40 is capable of using regular 87-octane unleaded gas, but for optimal performance, it is recommended to fill it up with 91-octane unleaded fuel.