Best Highway Fuel Economy for 3.7 V6??? - Page 3 - Ford Mustang Forum
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konatown's Avatar
Joined: Mar 2013
Location: Springfield
Posts: 83
Interesting article Don, thanks. I personally have achieved 36mgp at about 55-60 mph. 70mph will get me about 31mpg in good conditions. Then the mpgs begin to drop, 75-80mph will get me only about 26-27mpg. These #s are all on 2.73:1 rear gear, manual transmission. It seems to me that at 1800RMP and above the mpgs drop quickly. Can those with other rear gear ratio's attest to this?

2011 V6 Kona Blue, MT, 3.55's, airaid cai, 93R tune, BBK shorty headers, 2.5" exhaust, GT axle-backs, BMR rear LCAs, pony package, comfort package
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Katmandu's Avatar
Joined: Dec 2002
Location: Troy
Posts: 649
Originally Posted by Liv4spd View Post
How many miles after break in did you get that good MPG?

My 2014 V6 manual Mustang only has 1400 miles for now. I usually get only 16 MPG with half highway and half city driving. I do some heavy acceleration occasionally.
Your engine is still WAY too tight. Don't even look at MPGs until it's broken in around 5,000 miles or so. Drive it hard. Don't baby a new engine!

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Rocky2's Avatar
Joined: Aug 2012
Location: Atlanta
Posts: 80
Even on long trips I never seem to get better than 26 mpgs. But I never have driven 55mph on the highway. I usually try to keep it in the low 80's here in GA, right under the super speeder limit.
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