When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Going by your weighted foot theory,i would say 16mpg is'nt all that bad with what you have.
I would still check them though.
You say that your lean?Do you have an adjustable regulator on your fuel rail?