Good MPG in a GT

[krahooligan]

i broke 30 MPG on my way to San diego the other day. 45 miles. some traffic. yay fuel economy.

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[P4RKER]

Anybody ever bother to manually check the mpg the old fashioned way? You may be surprised at what you find. The computer is almost always a bit optimistic. I've tracked my mpg in my GT over 4 tanks and The computer is always higher. Seeing variances between as little as .3 all the way to a whole 4mpg difference. Most of them were 1-3mpg off per tank of gas.

My Normal commute is mostly city, so I usually land in the 15-17 mpg range. That's with heavy A/C and seat cooler usage though.

If you read the manual it explains the difference. The computer is average fuel economy based on time. It averages a bunch of instantaneous outputs rather than continuously calculating the distance travelled over the amount of fuel burned since last reset. The difference is minor but it does exist.

 

[Tristar]

Buy and GT when you buy a car like this !

Yea most of the V6 and for sure the new ECO guys are always trying to come up with reasons they got the slower car, it makes no sense unless you did it purely for price.

I was going to get an ECO to save money on the purchase and still have a cool looking car, but then the super nice and very good salesman which I have known for a while, said lets test drive both, and we did, The GT blows away the ECO in feel, sound and of course power. I wasn't willing to live with the ECO to get a few mpg more. The same day, the dealer had to pull 1/2 there inventory of the Eco, due to the Heat Recall Issue, and that was its final nail in the coffin for me. Glad I got the GT and the fact I am getting better MPG than I ever expected is a nice bonus.

Now on to more important things for me, need to replace those so so factory 18" wheels / tires. :-)

Chris / Tristar

 

[smitty]

I think the original intent of this thread was to bait the people who bought ecoboost cars a little bit. That's silly and has since been amended to recognize the pretty awesome fuel economy the GT can achieve on the highway. The only reason I didn't buy an ecoboost this time was that I wasn't going to use the GT as a daily driver. If I had needed to do that, it was obviously the best compromise between fun and economy. Here are the pictures of my car's IC as it sits in the garage. Trip 2 has never been reset and represents 50/50 city/highway driving. Trip 1 is 85% highway. It drops fast in town

 

[Asharus]

u guys getting 24+ mpg are still shocking me. you guys must not go past 15% throttle and always below 3k rpms or something.

 

[cbrookre]

u guys getting 24+ mpg are still shocking me. you guys must not go past 15% throttle and always below 3k rpms or something.

There is a name for that: JimmyTwoTimes driving

 

[Asharus]

lol i was thinking of him when i said below 3k rpm

 

[cbrookre]

If you read the manual it explains the difference. The computer is average fuel economy based on time. It averages a bunch of instantaneous outputs rather than continuously calculating the distance travelled over the amount of fuel burned since last reset. The difference is minor but it does exist.

Wonder why this is. I know that the computer will be taking readings at a set sampling rate, and the sensor will be calibrated but there will be some variation with different sensors. I wondered if the sampling rate or lack of proper calibration is causing most of the discrepancy. If it has a low sampling rate (to save power, or something else) then many of the throttle stabs may be missed by it and it will become more inaccurate the more you stab rather than smoothly apply the throttle. One could reason, if this was the case, the higher the mileage that you get, the more accurate it would become. Second is lack of accuracy of the sensor, which would lead to inaccuracy across the board, or would be affected more by environment or other fixed factors then driving behavior. I guess without some detailed analysis, we will never know...

 

[Asharus]

i've always expected a +/- 1-2 mpg difference between actual and OBC readings. my past bimmers and subarus have always been around 1mpg generous on the reading. i'm not surprised the mustang is as well.

 

[Branden]

i'd challenge everyone bragging here to post their lifetime mpg with the car.

That is really a moot point...

This thread is about excellent highway MPG in a GT. Not everyone has a mostly highway commute, so lifetime and highway MPG are irrelevant to the point at hand.

I took a 2 hour trip on Tuesday and averaged 27-28 MPG between 70-75 MPH in an Auto GT, stock gearing. My lifetime MPG? Last I checked it was around 15 MPG because none of my normal commute is on a highway.

I really don't care because if I wanted MPG I would have bought something else, but as others have said it can get great cruising MPG.

 

[thehunterooo]

There is a name for that: JimmyTwoTimes driving

2k or less.

 

[Shibby]

Every so often I find myself consciously trying to drive conservatively under 2000 RPM, and keeping an eye on the mpg number.

Then I think to myself: this sure as hell is not why I bought this car. Then I listen to the roar of the V8 and I feel better.

 

[Asharus]

i just do what i've been doing my entire life. drive conservatively, not going past 50% throttle, and shift no later than 3k while oil is not at operating temperature.

after that, it all depends whether or not somebody is in my way!

 

[peetucket]

I've just rolled over 1000 miles in a GT convertible. In mostly stop-and-go commuting traffic in the hilly Bay Area, I get around 14 MPG, and I am not driving it hard. I saw 20 MPG once on its single road trip up the coast, but that was with the top down, all four seats and the trunk filled and various slow stretches to enjoy the scenery. Perhaps one day I will see the mythical 25-30 MPG...one can only dream.

 

[Tristar]

The low # see odd to me

I must not be driving this as aggressively as I think I am ?

Our Avg since new is 19.2, And we drive tons around town, stop and go, lights and so on. Of course were still under 300 miles total?

The guys getting 13 must be driving it as fast and as hard as they can.

I think any car driven pedal to the metal every time will get pretty lousy mpg.

Chris

I've just rolled over 1000 miles in a GT convertible. In mostly stop-and-go commuting traffic in the hilly Bay Area, I get around 14 MPG, and I am not driving it hard. I saw 20 MPG once on its single road trip up the coast, but that was with the top down, all four seats and the trunk filled and various slow stretches to enjoy the scenery. Perhaps one day I will see the mythical 25-30 MPG...one can only dream.

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