Ford Mustang Forum - View Single Post - My gas mileage, how to improve?
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post #9 of (permalink) Old 02-28-2011
Redlyr
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Usually the highest gear you can go into without lugging the engine is the best. With my 3.73 rear ratio I can use 5th gear at around 40mph. For the stock gearing I wouldn't use 5th below 45mph.

As a side note to what Mark said, I can still manage 28-30mpg @ 70mph with 3.73s.
 
 
 
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