Compression Ignition Addict
Join Date: Sep 2007
Location: Eula, TX
Thanked 42 Times in 42 Posts
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I have found with the ultra low sulfur diesel that my milage was suffering. I use an additive which has not only helped increase my milage but my engine is running quieter. I average 100 miles per day and spend a lot of time at the pump (I avg 19mpg). I agree with the others, check your air filter, fuel filter, and oil level (since the 7.3 has oil driven components).
Another thing, with the change in seasons milage has a tendancy to fluctuate not only due to temperature, but also due to fuel additives(anti-gel, etc.).
2008 6.4L 4X4 Lariat
6.4L w/SCT Livewire, Deleted, and loved! About to hit 200,000 miles!
RIP 2003 7.3L Limited Excursion 4X4 & 2007 6.0L Lariat FX4