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In page McDonnell Douglas MD-90:

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Typical seating for the MD-90 ranges from 153 to 172 passengers, depending on the cabin configuration and interior layout.[4] The MD-90 was produced in two versions: -30 and −30ER. The −30 has a range of 2,045 nmi (3,787 km; 2,353 mi). The −30ER has a higher gross weight and range up to 2,455 nmi (4,547 km; 2,825 mi) with an extra 565 US gal (2,140 L) auxiliary fuel tank.[5] An even longer-range version, the −50, was offered but was never ordered.[citation needed]