Compression Ignition Addict
Join Date: Feb 2009
Location: Nacogdoches, TX
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Like all said, 15 is about right. Depending on if you get winter fuel or not, you're doing good.
10 is low, but it depends on driving, tires, gearing, lift, load, etc.
There are MANY things to check to help your MPGs.
Brake caliper slide pins, tire pressure, bearings, internal motor, trans, and diff resistance, air resistance, and many other sensors and things that can do it.
2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
330,000 + miles