I know this is old, but this is so wrong I couldn't help but comment.
DEF does absolutely NOTHING to help with power or mileage. I would really love to know where you got that caca from...
DPF and EGR seriously choke a diesel engine making HP and mileage far worse.
But before you post another topic, it should be noted that you're wrong. DEF systems generally do not negatively impact MPG, and in fact, can often lead to a slight improvement in fuel economy by optimizing engine performance and reducing the workload on emission control systems, allowing for more efficient combustion; some manufacturers claim a fuel efficiency increase of up to 5% with DEF usage. Now if you totally DEF deleted a truck and re-tuned to run based on the lack of DEF equipment, it might get better mileage. But at what cost? The cost to remove it, the increase in emissions, loss of any warranty and it's illegal in most states and you might get marginal gains. Why bother?
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No... I am not wrong. Not even in the slightest little bit wrong. Tell me you don't know diesels without telling me you don't know diesels.
Does DEF improve mileage on a DPF equipped vehicle without DEF? Maybe. That isn't the point. The point is the emissions equipment on diesels is VERY bad for the engine, REDUCES mileage dramatically, and does nothing for the environment. This is fact. Tree hug all you want, you'll still be wrong.
Yea, this is old. 12 years old. And mccsix hasn't been on here in about 5 years. If you have some valuable information you may want to post it in a new topic instead of buried in a decade old post.
