This may depend on the year of your vehicle but using the 2020 BMW X5 as an example, the fuel tank capacity is 21.9 gallons. As you might expect with a luxury vehicle like this BMW the MINImum fuel grade you should be filling up with is AKi89 and anything lower than that can lead to engine knocking. The recommended fuel grade is AKI 91 though and you'll get the best performance and fuel economy when using it. While it's not mandatory I find that it's worth a bit of extra money at the pump to get the most out of the vehicle. - Scott L.
Angel M.
April 10, 2020
The fuel tank capacity in a bmw x5 is 21.9 Gallons.
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