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Re: 2008 Sprinter mileage
Some salesmen will say ANYTHING to get a sale. Imo the guy obviously noticed you were concerned about mileage and is manipulating you.
His comments are simply not true. First of all, most Sprinters are diesels, which have no converters, and do provide better mileage, but cost more to buy when new.
Removing converters from a modern gasoline-powered vehicle will result in a 'check engine' light coming on, and may affect the performance of the ECM.
Finally, converters are efficient. The first generation of converters used by GM 30-35 years ago were somewhat restrictive and gave converters a bit of a bad reputation, in the minds of older drivers.
But for decades now, converters have excellent flow and do not impede a stock engine's performance in any significant way. Most likely, if you did remove the converters, you would be breaking the law, make the vehicle noisier and would not notice any mileage change.
As for lifespan, the diesel Sprinters have a shot at lasting that long, if they are maintained properly, and accumulate lots of long-distance highway miles. But don't count on a gasoline engine lasting that long.
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