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S197 Gas Mileage Roundup - V6's, V8's, Autos and Manuals

10010 Views 60 Replies 38 Participants Last post by  Cusp
Submit yo' info, not just another "Gas Mileage" thread....I hope...and NOT about gas PRICES neither!

I could be wrong, but I have not seen a really full comparison-based accounting here of owner experience with gas mileage and the different drivetrain combinations. I am VERY curious about this after reading between the lines of some other owners and also having a co-worker with a V6/Auto that sounds like it's getting the same, or worse, mileage than my GT/Manual car.

Obviously driver habit and conditions have a lot to do with it, but the "Average MPH" reading on the Message Center (for those who have the IUP) can help indicate your environment to an extent. I think it would be very interesting to see where the four different engine/trans combos stack up, if all interested parties can provide some of the minimal information such as:

Average MPG (per tank)
Engine - V6 or V8/GT
Trans - Auto or Stick
Average Speed (from "Message Center" if IUP-Equipped)
Engine/Drivetrain Mods, if any.

And maybe the additional info if willing:
Your own rating as a "fuel-economy-conscious driver" Leadfoot, Occasional Puncher, Lightfoot.
Best MPG you've seen in any single stretch:

Sure, I'll go first:
Average MPG per tank:..... 17.5 MPG
Engine - V6 or V8/GT.......V8 GT
Trans - Auto or Stick......Stick
Average Speed..............28MPH (lotta heavy creeping rush-hour freeway traffic, plus suburban/city stuff)
Engine/Drivetrain Mods.....Stock (aftermarket shifter shouldn't be a factor)

My own rating: ............Occasional Puncher (how can you NOT sometimes?!??! :D )
Best MPG I've seen in trip leg: 26.9 MPG

My theory/question here is that the Stick GT's will probably be really comparable to the auto-equipped V6 Mustangs, more than the EPA numbers on the window sticker would indicate. And I'm rooting for the manual-equipped V6's to come in as the winners. Interested in how auto-equipped GT's stack up too. Who knows, maybe the results will have widespread and far-reaching ramifications that may actually influence someone's purchasing decision.....aren't you curious too?
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Average MPG per tank:..... 19.8 MPG
Engine - V6 or V8/GT.......V8/GT
Trans - Auto or Stick......Stick
Average Speed..............39 MPH some hwy
Engine/Drivetrain Mods.....Stock

My own rating: ............Occasional Puncher

Best MPG I've seen in trip leg: 24 MPG
- From gas station/work to home, driving really careful!(up & down hills and traffic).
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For the most part, I have seen that the lower I keep the RPM, the better the gas mileage. If you can keep it in the 3500 or lower as you are shifting and cruising, you will get the best gas mileage. An easy way to see this would be to have the passenger hit the reset button quickly with the average mileage display showing, as you the driver accelerate through the gears. The passenger can then quickly determine at what RPM is the highest MPG in real time. If I could alter the computer programming for the message center, I would enable a real-time MPG display.

Another interesting note, if you turn the ignition on (don't start the car) while you are fillling up, you can watch the "miles until empty" number go up as the car fills up. Maybe the total mile numbers end up slightly different because different amounts of gas are put in on each fill up? Or maybe it is based on the previous average MPG in the computer?

Premium Torch Red Mustang 2005 GT
Bullit Wheels
Rocker Stripes
Locking gas cap
Removed H/C trap(no problems)
Locking Wheel Lugs
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