Interesting. Runs counter to using an oil sep to keep PCV oil from building carbon in the intake.

 

Under drive pulleys and an aluminum driveshaft will save some fuel, but might not be worth the expense. Drive it like there is an egg between your foot and the gas pedal and as another poster stated make sure the tires are properly inflated. Another alternative is to do what I did and get a Corvette as it gets 30mpg on the highway. I hate Chevrolet so I am thinking about putting some Ford badges on it.

Bob

 

That's why if you do get a bike, you should make it an old Jap bike. They're cheap, reliable, and still get great gas mileage. My 1982 Honda Sabre would cost about $1200 (i got it for free) and gets 45 MPG on the highway. But it really pays dividends around town where it still gets 30+ whereas my stang only does 15-17MPG. And, btw it's a 750 with acceleration that matches the Mustang. Not to shabby for a 29 year old bike. You can save money and still have fun.

Your investment would be in the cost of the bike, licensing, and protective gear. But insurance and registering it is real cheap. Plus, it'll keep the miles off your Mustang

But yeah, you should never get a motorcycle strictly for financial reasons. The minute you count on it being cheaper, it'll let you down. Carbs will need a rebuild, or transmission goes, or somebody hits you, etc. Now a bicycle on the other hand...

 

well properly inflated is a relative thing. ford recommends 32psi. Thats based on comfort and not mileage. I would up the tire pressure to 35-36psi, but no higher. It will get 1+ mpg higher that way and it will handle better to boot. Keep it between 65-70mph, dont fight hills, if your accelerator is in a certain position during flat land and it will maintain 65-70mph. Then keep same accelerator position even during up hill, the car will slow to 55pmh or so but you wont use any extra gas to fight the hill.

 

I got some Steeda under drive pulleys. With install for me, $100 bucks- the total cost was 280 bucks or so. MPG increased 1-1.2 mpg. Plus freed up HP.

Also, this isn't mentioned often but the SCT eco tune to get better economy.
http://www.lethalperformance.com/07-...rammer-p-19220

 

As Ministang said, a mod like this will indeed get you better mileage, but it will take you so long to recoup the difference that you may never make it up. You're probably a lot better off just changing driving technique. Slow easy acceleration, short shifting, and using the cruise control are going to get you the best mileage.

No matter what you do, driving a 2005-09 GT in the city is likely going to be 16-19 mpg under the best conditions.

For a couple years I had a work commute that was 13 miles, with 10.2 miles on the highway. That's about 78% highway and 22% city. I consistently averaged almost an even 20.0 mpg, when trying to milk the mileage out of it.

Now I have a 6 mile commute where I don't get on the highway at all, and have to deal with 12 stop lights. On a lucky day, I'll get a green light on 8 of them. I can do no better than 16-18 mpg with this commute, and it's closer to 16 in the cold weather.

Oh, and unless you have mods or a tune, you're just wasting your money using anything other than 87 octane.

 

I usually run 87 octane Brenspeed tune with my Ford Racing CAI. I drift down hills as often as I can, drift as often as I can near stop lights. Try to run around 60 mph on interstates and buy ethanol free gas whenever possible. On average with my GT/CS on lengthy trips I get 28-30 mpg. It drops to 25-27 mpg if I drive 70-75 mph. The best I ever got was on a trip to see my father who is about 130 miles away with most of the driving zone being 55 mph. I drove 50-55 round trip, filled up and got 34 mpg this past summer. So, driving speed has been the biggest factor for me.

 

Thanks for everyones input, you have given me insight on every way possible to increase my MPG!

 

Wow, 34 mpg!! The only way I could do that would be to drive my daughter's Mini Cooper, and even then I'm not sure it would get 34...

Seriously though, has your GT always gotten better than the advertised EPA 17/25 mpg? Did the tune improve it even more? That is amazing gas mileage. (if all it takes is a tune, which also improves performance, you wonder why Ford wouldn't tune it like that from the factory?)

Even averaging 28-30 blows my mind. My car has never done that well, and I have tried with certain tankfuls, never going over 55, short-shifting, etc... And mine seems to run really good too, so I don't think anything is wrong with it. I'm really happy if I can average 24-25 on a trip.

 

Sell the stang and use the money to buy a cheap used civic dx LOL Just kidding. Just follow the advice given, short shift, cruise, coast when possible. But what do I know, Ive been driving a 4cyl Jeep that only gets 11 city 16 hwy LOL so for me the Stang will be an increase in MPG right away LOL

 

The day I got 34 mpg I was on a routine trip that is 125 miles one way and the speed limit is 55 mph most of the way on a 2 lane road. I kept it at 50 mph when no other cars were around just to see how good I could get my mpg on one trip. I was using my 91 octane Brenspeed tune with 93 octane ethanol free gas. Better fuel mileage is the main reason I bought the Brenspeed tune, not the power. I enjoy both of them though.

Yes, my car has always gotten better mpgs than the sticker said. I do drive it conservatively though. I want it to last at least 300,000 miles and driving it like I stole it might not get it there. I owned a 2006 V6 Mustang before this GT for one year and it didn't get as good gas mileage as the GT but, I had no mods on it at all.

I went back and looked at my window sticker and for hwy mpgs it says 23 but under that in small print it says 19-27 is the expected range for most drivers. Before the tune and intake I averaged the high end of that. Still, driving habits and overall speed are the most determining factors. On most tanks of 30 mpg, I still stomp it about a half dozen times from 20-70 mph to have some fun. Most of the time it's coming off of a freeway ramp. I've got 94,000 miles on the car now and it's been a dream car so far. No real problems yet. Just small stuff.

 

I run Sunoco 89 and get 20 mpg average(1/2 city/highway to from work)- on 87 I get 18, on cheep 87 I get16-17...only fairly long trip was to Pa, got just under 25 at 70(was still running 87 then- havent tried 89 on long highway cruise). Running 89(stock tune) idle quality is degraded a bit, otherwise, just averages about 10% better mileage.

tried 89 in my wifes 07 avalanche- dropped to under 15, on sunoco 87 she gets 17, on the cheepest 87 you can find she gets 18- just the reverse of the mustang...best her truck ever got was just a hair under 24 over a 4000 mile Colorado trip- I was impressed that such a tank could do that.

Ive got a old grand marquis for winter car, its like her truck- likes the cheap gas- I kinda think the mustangs stock tune MUST adapt the timing a little bit with knock sensor feedback- otherwise higher octane SHOULD reduce mileage.
I wonder if just adding a couple degrees timing AND running 89 in 'non performance' type driving would pick it up a little(knock sensors should still protect the engine if necessary).

I hope to get a tuner this summer and play around a little bit- really really wanting to do a cross country trip in the mustang(the route 66 trip) and if we take 2 cars, would love to get the mileage up as high as safely possible(factory tune has to be engine safe no matter who/how its driven- thinking a economy tune COULD really do a lot- especially if combined with higher octane to pull as much timing as possible at cruise)

 

I get bad mileage from all my vehicles simply because my city has the worst timed traffic lights I've ever seen. Take off from a green light, next light turns red just as I get to it. Idle for a minute or two, take off again and repeat for the next light. Again and again and again...........

 

I just got my 07 GT 5MT 13 days ago, so far only driving around the Charleston SC area, I'm getting just under 21mpg. This is probably 55% city driving in rush hour traffic. I have only used sunoco 87, with factory tune. MPH avg according to info center is about 30. Not a bad deal coming from a jeep that avg'd 15-16 doing the same drive

 

Is that a lot of stop and go or just slow/steady traveling?