Fuel Gt 6 Spd Owners. Whats Your Highway Mpg?

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Don Karnage

New Member

Dec 13, 2011

7

1

1

Dec 17, 2011

#1

• Dec 17, 2011

• #1

Just curious what your highway mpg is like? Not to worried about the city as 85% of my driving will be interstate.

 

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Don Karnage

New Member

Dec 13, 2011

7

1

1

Dec 17, 2011

#2

• Dec 17, 2011

• #2

6Spd Manual ofcourse

 

MoshpitMad

Active Member

Oct 26, 2011

130

5

28

Albany, NY

Dec 17, 2011

#3

• Dec 17, 2011

• #3

I haven't done a full trip on the highway, so it's hard to calculate exactly. I have gotten 22ish though with a mix of some city/mostly highway on a tank though. I imagine you'd see 25+mpg

 

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Don Karnage

New Member

Dec 13, 2011

7

1

1

Dec 17, 2011

#4

• Dec 17, 2011

• #4

MoshpitMad said:

I haven't done a full trip on the highway, so it's hard to calculate exactly. I have gotten 22ish though with a mix of some city/mostly highway on a tank though. I imagine you'd see 25+mpg

Click to expand...

What rear end gearing do you have?

 

Reactions: Juice2012

Az Pete

10 Year Member

Mar 30, 2005

711

18

49

Panama City, Fl.

Dec 17, 2011

#5

• Dec 17, 2011

• #5

3:55 rear in mine......I can get 26 mpg without any speed bursts and cruising 70 or so.

 

MightyMike16

New Member

Oct 30, 2011

7

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1

Long Island NY

Dec 17, 2011

#6

• Dec 17, 2011

• #6

3:73 here. 22.5MPG...

 

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Don Karnage

New Member

Dec 13, 2011

7

1

1

Dec 17, 2011

#7

• Dec 17, 2011

• #7

Az Pete said:

3:55 rear in mine......I can get 26 mpg without any speed bursts and cruising 70 or so.

Click to expand...

With 3.31's 26mpg should be easy. Thanks guys

 

Coyote5.0

5 Year Member

Aug 27, 2010

625

102

64

Portage, Wisconsin

Dec 18, 2011

#8

• Dec 18, 2011

• #8

I can get 28 mpg consistently with the cruise set at 70 (after about 1000 or so break in miles). On two lane roads going 60ish, it can do a little better. Even when I find some curvy backroads and have a little fun with it, it still gets mid 20s.

Mine has the 3:31 rear. I also know where to go for no-ethanol gas, which helps.

 

MoshpitMad

Active Member

Oct 26, 2011

130

5

28

Albany, NY

Dec 18, 2011

#9

• Dec 18, 2011

• #9

I have the 3.31 gears.

 

Terry keeter

New Member

Dec 19, 2011

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0

1

Dec 19, 2011

#10

• Dec 19, 2011

• #10

I drive from Jacksonville FL to Dothan AL about once a month and i can do it on one tank and still drive around town for a day on the same tank so its a lot better than i thought it would be.

 

Juice2012

Member

Sep 9, 2011

85

4

8

Dec 23, 2011

#11

• Dec 23, 2011

• #11

Manual and 3.73 = 25mpg

 

jbrillo

Founding Member

Feb 1, 2000

229

1

18

Houston

Dec 24, 2011

#12

• Dec 24, 2011

• #12

Manual, 3.73's and I'm getting 25.7-mpg on the freeway at 70mph.

 

Bad Boss 302

Member

Dec 5, 2011

170

6

19

Dec 25, 2011

#13

• Dec 25, 2011

• #13

I took a 2600 mile round trip from Dallas to Florida. I only averaged about 22 mpg. However, I was crusing about 80 - 85 mph most of the trip. I have a Boss and 3.73 gears.

 

LAVAgt2012

Well-Known Member

Aug 11, 2011

1,098

28

58

Panama City, FL

Dec 28, 2011

#14

• Dec 28, 2011

• #14

3.55 gears; 23 mpg

 

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Satin Silver GT

Member

Jul 12, 2003

127

0

16

Sagamore Ma.

Dec 29, 2011

#15

• Dec 29, 2011

• #15

6m, 373s checked it once by hand with 700 miles on the clock. 22 MPG mixed driving

 

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ccaron

New Member

Mar 1, 2011

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1

Bridgeport, CT

Dec 30, 2011

#16

• Dec 30, 2011

• #16

3:31 here about 25-25.5 at 75-80, 26ish from 70-75, and mid 28 range from 50-55 on the back roads.

 

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madweazl

Founding Member

May 30, 2001

203

16

18

Woodbridge VA

Jan 2, 2012

#17

• Jan 2, 2012

• #17

3.73s at 80mph on the trip home I averaged 23.2mpg. Car has 200 miles on it.

 

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dcanestro

Member

Jun 22, 2011

40

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6

Simi Valley, CA

Jan 21, 2012

#18

• Jan 21, 2012

• #18

Yesterday, at 60-65 MPH in the rain on the freeway, the computer showed me 28 MPG with my 3:55's.
Tach reads 2K at 65ish.

'12 GT, 6Man, BBK CAI, Flowmasters (American Thunder, axle backs), Brembo Package, 3:55's.

 

Sparty92

Member

Jul 30, 2007

430

5

19

Detroit Burbs

Jan 25, 2012

#19

• Jan 25, 2012

• #19

I did a simple test of 1 hour on the freeway, 70 mph, A/C on (I think). 6-speed manny tranny with 3.73s. I could only pull 22-24 mpg. The car is turning 2,250 rpm in 6th. My 2007 with 3.55s would turn the same rpm in 5th and could squeak 30-32 mpg at 70 when driving for hours.

What I find puzzling is that if both cars turn the same rpm at the same mph, why the huge variance in mpg?

 

Coyote5.0

5 Year Member

Aug 27, 2010

625

102

64

Portage, Wisconsin

Jan 28, 2012

#20

• Jan 28, 2012

• #20

Sparty92 said:

I did a simple test of 1 hour on the freeway, 70 mph, A/C on (I think). 6-speed manny tranny with 3.73s. I could only pull 22-24 mpg. The car is turning 2,250 rpm in 6th. My 2007 with 3.55s would turn the same rpm in 5th and could squeak 30-32 mpg at 70 when driving for hours.

What I find puzzling is that if both cars turn the same rpm at the same mph, why the huge variance in mpg?

Click to expand...

A lot of things affect fuel mileage. Gas today tends to have more ethanol in it than just a few years ago, so there is about 2 mpg right there.

Did you do this test recently? Winter blend gas tends to give lower fuel economy than the summer blend. Winter temperatures significantly reduce fuel mileage as well (air resistance increases about 10% for every 50 degrees the temperature cools). Have you checked your tires, cold winter temperatures mean the pressures fall if you don't add any air. Last year, I was getting about 28-30 mpg on long trips with my 2011 GT (with 3.31s) during the summer, but later in the fall, just before I put it into storage, it was struggling to make it to 25 mpg for all of the above reasons.

Break-in could also be an issue, if you don't have many miles on it. And, surprisingly enough, the number of miles you have on your tires can make a huge fuel mileage difference. As tires wear and age, their rolling resistance goes down significantly. Your new car has new tires, and the 2007s would have been more worn. My daily driver/commuter car used to get about 34 mpg when it was new. It gradually improved a little every summer until at 6 years and 80K miles on the original tires, it was getting around 40-41 mpg regularly. Then, I repleaced the tires, and it immediately fell back down to about 34. (You could actually feel from the driver's seat that it didn't coast as well anymore). The second set of tires is now about half worn, and the fuel economy is back up to about 37-38 again.