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Cummins motors are traditionally a nuisance to work on, but the 8.3 litre is a pretty solid motor. IIRC, the 1991 model year motors were all mechanical, rather than electronic. Your fuel mileage won't be particularly impressive... you can expect three to five miles per gallon.

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13y ago
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Q: Is there any common problem with 1991 diesel 8.3 ltr Cummings 300 hp what did they get 4 milelage?
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