Compression Ignition Addict
Join Date: Feb 2009
Location: Nacogdoches, TX
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Average runs 15-17, so you are low.
You could have a boost leak, a pre turbo exhaust leak, brakes, and other things. A brake alone shouldn't drop you that much. I think it's a combination of things. I'm down 1-2MPG right now, and I know that I need an alignment, so I'm sure that's part of it.
Fixing a sticking caliper on the rear gained me 1MPG.
2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
330,000 + miles