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.
... are you leaking gas? It seems quite hard to get 5.8 mpg, unless you're towing a 6 ton block of concrete that's staked to the ground... or you drive 3/4 throttle half the time and full throttle the other half of the time
Edit: are you sure you're measuring it right too? Do you have gears and not the right speedo gear? Bigger tires?
I get a wopping 12-14 with a lot of highway driving. Im fuel injected too. But what ever thats what I expected when I bought the car. But still 5.8 is really ****ty and I hope you get that fixed.