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2011 GT mpg question

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Old 12-31-2011, 02:17 AM   #21
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Quote:
Originally Posted by JIM5.0 View Post
You, sir, are cheating
what, isnt that what everyone, including car manufacturers do to up their posted mpg's? :P
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Old 12-31-2011, 09:50 AM   #22
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Lol, yeah, probably true. Kia advertises some of their models get over 30 mpg hwy, but even after a good engine break in(3000 mi+), I had people tell me that they can't reach that 30mpg. They say they don't floor it, but I am somewhat doubtful. In a four banger, I myself will floor it just to be able to accelerate with the traffic flow.
They say they don't have mods of tunes, but I don't know for sure. I never looked under their hoods. I do tend to believe this because, why would anyone mod a Kia?
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Old 12-31-2011, 10:02 AM   #23
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Lol, yeah, probably true. Kia advertises some of their models get over 30 mpg hwy, but even after a good engine break in(3000 mi+), I had people tell me that they can't reach that 30mpg. They say they don't floor it, but I am somewhat doubtful. In a four banger, I myself will floor it just to be able to accelerate with the traffic flow.
They say they don't have mods of tunes, but I don't know for sure. I never looked under their hoods. I do tend to believe this because, why would anyone mod a Kia?
So they can run them 12's yo
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Old 12-31-2011, 10:16 AM   #24
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with my old lump and driving in the foothills of the Rockies I have seen 28.2 Canadian mpg which is fantastic in my mind
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Old 01-01-2012, 05:29 PM   #25
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Got average of 26.2 mpg driving my 2011 GT 65-70mph. Dropped to 25.2 mpg after I drove it 75-85mph, mostly highway.
Car is stock with 3000 miles on it.
Its my first Mustang and I cant belive how comfy the car was on a longer trip. Drove it today from Frisco NC to Long Isand NY, 560 miles. Not only got great gas millage but had fun driving it. Realized one thing tough, its SO EASY to speed in this car, 100mph didint feelt lie it at all. Sorry to go a little of topic, Im still very excited about my new car :-)
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Old 01-07-2012, 09:42 PM   #26
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I getting around 23 MPG driving it easy.
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Old 01-08-2012, 08:28 AM   #27
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Averaging 17.3 per the computer with about 50/50 city/hwy. Have almost 6200 miles since Oct. Almost always 93 oct. (maybe a total of 10-15 gallons of 89 since I bought it.) On trips longer than 40-50 miles, MPGs are awesome. 26-28mpgs. In town. Ugg, it BAD. 10-15mpgs. I'm pretty happy w/ 17-18 average though. My big-*** truck got a BEST of 20mpgs on a trip. And 93 is MUCH cheaper than Diesel these days. Car is saving me about $15-20 a week in fuel!
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Old 01-08-2012, 11:55 AM   #28
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Yeah, I see the same thing. In trips around town, no hwy at all, all speed limits 50MPH or less, my in-city only MPG drops to maybe 16MPG avg. Stop lights and slow speed limits completely DESTROY fuel economy.

As for gas being cheaper than diesel, I hate to say savor the moment. Car sales in China is sky-rocketing, China already out-strips the US in cars being bought. In the next several years, there will be enough car drivers in Asia such that they will put an extreme pressure on the global fuel supply for gasolines, and gasolines will once again be much higher than diesel.
The only reason why diesel is actually higher now, is because massively industrializing countries like China, India, & Brazil, of course are first buying tremendous numbers of trucks and diesel trains to support they new factories. But once their general populations start buying cars (which will of course vastly be gasoline fueled), then the gas prices will will jump to ~$5 USD for 87 octane at the pump for us. And diesel will hit around the $4 per gal mark.
I do not know what the current predictions are for when this will happen, but I know it will happen unless there is a huge paradigm shift in fuel usage.
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Old 01-19-2012, 03:14 PM   #29
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With my 2011 5.0 manual with 3.73 gears I hold it at no less than 80mph from Baton Rouge to Houston and see almost exactly 22.0 mpg every time
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Old 01-19-2012, 03:50 PM   #30
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If you have 3.73:1 rear gears, yeah, the fuel mileage will not be the advertised 26mpg hwy.
Also, you car will improve in mpg once you reach 5000 miles.

I have 3.31:1 rear gears on mine and on straight highway at 70mph, I get 28mpg. I have seen on rare occasions 30-31mpg average.

What destroys fuel mileage are stop signs, stop lights, and speed limits less than 60mph. City driving. In city driving I see high teens mpg avg.
Mixed hwy and city I see 21-23 mpg avg over a month time.
Actually, to get the best MPG highway, a speed of 55mph is the best. Your manual will confirm (if you don't believe me ) as well as any physics major that speeds over 55mph will exponentially lower your MPG. Sports cars may be better because they are built for aerodynamics, but as I said, even our vehicle manuals will tell us the difference between 55mph and 65mph is a 15% loss in gas efficency.

http://mpgforspeed.com/
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Old 01-19-2012, 08:27 PM   #31
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Actually, to get the best MPG highway, a speed of 55mph is the best. Your manual will confirm (if you don't believe me ) as well as any physics major that speeds over 55mph will exponentially lower your MPG. Sports cars may be better because they are built for aerodynamics, but as I said, even our vehicle manuals will tell us the difference between 55mph and 65mph is a 15% loss in gas efficency.

http://mpgforspeed.com/
Its a lot more than the speed you are traveling. Ideally, you would try to make the car go as fast as possible using the least amount of fuel (Duh). This is done by matching the rpm that the engine has maximum fuel efficiency, the output of the engine at that rpm and throttle position, with the power necessary to overcome the highest drag force possible. The last part is done with the gear ratios. Example would be ( i did this a few year ago) a truck with a drag coefficient of .5 (prius has a Cd of .2-.3) requires approximately 50 hp to maintain a speed of 60 mph. Formula is 1/2*rho*Cd*Area*Velocity^2 for drag force, drag force * Velocity is power (in watts), then convert to hp if anyone cares to figure it out.

End result is probably around that magical 55 number because engines are only 18-20% efficient (avg) with most of the energy going to heat, and the drag on cars, while improved over the years, is still there.
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Old 01-20-2012, 01:23 PM   #32
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Its a lot more than the speed you are traveling. Ideally, you would try to make the car go as fast as possible using the least amount of fuel (Duh). This is done by matching the rpm that the engine has maximum fuel efficiency, the output of the engine at that rpm and throttle position, with the power necessary to overcome the highest drag force possible. The last part is done with the gear ratios. Example would be ( i did this a few year ago) a truck with a drag coefficient of .5 (prius has a Cd of .2-.3) requires approximately 50 hp to maintain a speed of 60 mph. Formula is 1/2*rho*Cd*Area*Velocity^2 for drag force, drag force * Velocity is power (in watts), then convert to hp if anyone cares to figure it out.

End result is probably around that magical 55 number because engines are only 18-20% efficient (avg) with most of the energy going to heat, and the drag on cars, while improved over the years, is still there.
Thank you for the elaboration . My brother explains this to me everytime he's in the car with me and I go over 55mph (he is an engineer). Bunch of wisenheimers if you ask me (I kid ).
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Old 01-20-2012, 05:31 PM   #33
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..is probably around that magical 55 number because engines are only 18-20% efficient (avg) with most of the energy going to heat, and the drag on cars, while improved over the years, is still there.
With a 3.31:1 rear gear and stock sized tires, I actually notice my best avg MPGs increase above 60MPH in 6th gear (OD).
I find my peak avg MPG to be at 70MPH given no wind, straight flat highway with light traffic where everyone is going speed limit (70MPG PSL)

Now, with higher rear gear ratios on an MT82, like the 3.73:1 rear gears, yeah, you might be getting your peak avg MPG at around 60MPH
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Old 01-21-2012, 09:09 AM   #34
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Wisenheimer indeed, it is my duty as an engineer to educate the masses! I miss my university paid for software that let me play around with equations like that. I wish we had an instantaneous mpg meter, would settle a lot of speculation, assuming we take everyone's word on "level ground" and "no wind". No offense intended Jim.
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Old 01-21-2012, 02:04 PM   #35
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None taken at all, and I am actually glad there are ppl who understand this sort of stuff, even if we are the only ones that do.
I unfortunately do not have access to such software, so in my case, I would have to calculate it the hard way: calculator and graphing paper.

The only measuring tool I used is the on-dash MPG calculator. I typically dont use it in an instantaneous manner, but on the few times my curiosity hits me, I hit reset while cruising down the freeway to see what my instantaneous MPG is.
I don't know just how accurate this bit of software is in our cars, but since it is measuring the amount of fuel being burned in comparison to speed, I assume it works well in guessing just how much fuel you would burn in a mile if you remain at those conditions.

Others have expressed that the on-board MPG calculators are not accurate, others have said they suck at instantaneous measurements and are only useful over very long times, like over a weeks time or even a months time, so I am actually up in the air on this one on what to believe
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Old 01-21-2012, 09:13 PM   #36
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I no longer have access so the calculator and paper is my method now, just reminiscing. Considering the device in question and its data recording interval I do not have much faith in the dash meter. Unless they actually put a calibrated flow meter in the fuel line (doubtful), the gal/min measurement is probably from an empirical flow curve that is calibrated to the amount of amps the pump is drawing. It could also be something that is pulled off the fuel maps and multiplied by the correlating rpm. It would be nice to know what the exact mechanism is, and short of direct explanation from a Ford engineer/designer we will never know. Same kind of thing with the speedometer not matching the mph on some gps units. If those two different systems dont match up, who is to say that the mpg is right either?
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Old 01-22-2012, 09:14 AM   #37
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I've got 11000 miles now on my '11 with the 3.73 rear. On a recent road trip of 1200 miles my highest mpg was 23.58 on the highway between fill ups (using a gas mileage calculator app on the phone, not the one on the dash) This is averaging between 80-85 mph. City driving fluctuates, I see between 13 and 17. As someone commented before me, the MPG did increase as the miles went up. I was getting like 12-13 city and 20 highway before the 5k mark.
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Old 02-16-2012, 04:39 PM   #38
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I see between 19 and 23 mpg on regular fuel in my GT
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Old 02-16-2012, 11:13 PM   #39
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Default Cheap easy hybrid

Hey guys,

I'm a mechanical engineer, so I've been wondering about "hybriding" the Mustang somehow for fun even if it's a conceptual design.

Have any ideas? Crazy ideas are fine even.

Mine:
  1. traditional battery and motor
  2. flywheel
  3. heat salvaging
  4. harnessing vibrations from suspension
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Old 02-17-2012, 09:35 AM   #40
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Just drove the 650 miles back from the Super Bowl.
I-70 doing 80 mph the whole way.
24.6 mpg with three people in the car.
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Old 02-17-2012, 09:35 AM
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