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2005-2010 Mustang Talk Forum

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Unread 05-07-2007   #1 (permalink)
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Default 2006 Mustang GT Gas Mileage

I am driving 500 miles to canada this weekend and then 500 miles back for a hockey tournament. I am taking the Mustang.
My question:
Which is the best gear for gas mileage to drive in while CRUISING the 500 miles there and back. I plan on cruising at 75 MPH.
It is a Manual Tranny.

When I drive around the city and go out to Jersey, I usually dirve in 4th, only going to 5th when speeds exceed 95.
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Unread 05-07-2007   #2 (permalink)
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I would just keep it in your highest gear and set the cruise. Unless you hit some grades or need to pass that should be the best mpg. You shouldn't have to wait until 95mph to cruise in 5th....
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Unread 05-08-2007   #3 (permalink)
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Absolutely 5th gear. No reason to run 4th on the hwy unless you're in the hills.
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Unread 05-08-2007   #4 (permalink)
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Not to be a wise guy...but I would be more concerned about the gas you may have wasted in the past driving in 4th all the time as opposed to the gas on this trip.....
But seriously, keep this in mind on your trip....It is a long trip and I know you're planning on saving fuel so just set the cruise and relax....But here is the main point, it is easy to get sucked in with the speeding cars so avoid temptations. Also, find a "Car" who is going an exceptable speed and stick behind him. Don't get your car sandblasted by hanging behind a Truck. I know it seems tempting to "Draft" him, but if there is anything on the road, like a shredded tire etc. You'll never see it until too late.
So keep your cars finish safe too on this trip!!!!
Good luck...
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Unread 05-08-2007   #5 (permalink)
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Wow, I sometimes cruise at 40-45 in 5th. I go to 5th anytime I can. I'm also getting 19.8 mpg around town.

Cruising 75 in 5th you can get around 24-25 mpg on the highway.
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Unread 05-08-2007   #6 (permalink)
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Our owners manual says to shift to 5th at 40MPH. (2nd @ 10MPH, 3rd @ 20MPH and 4th @30MPH) I will usually shift to the next gear when on level surfaces. Under heavy acceleration, I will shift from 2nd to 5th about 55 or so. "Rev on the Red Line"
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Unread 05-08-2007   #7 (permalink)
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its a basic formula. you take a certain speed lets say 50 MPH. Then you compare the gears. lets say 3rd, 4th, and 5th. Under 3rd gear you would be at (these are not realastic numbers) 5,000 rpm, under 4th gear you would be at 4,000 rpm, and in 5th you would be at 3,000 rpm. Naturally in 5th gear, going 3,000 rpm, making the engine work not as hard as it would in 3rd gear going 5,000 rpm, you will optomize your mileage by going in 5th gear whenever possible, thus making your engine work less hard thus saving gas.
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Unread 05-08-2007   #8 (permalink)
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Default Like the song "You can't always get what you want"--mpg..

Quote:
Originally Posted by hotshot View Post
its a basic formula. you take a certain speed lets say 50 MPH. Then you compare the gears. lets say 3rd, 4th, and 5th. Under 3rd gear you would be at (these are not realastic numbers) 5,000 rpm, under 4th gear you would be at 4,000 rpm, and in 5th you would be at 3,000 rpm. Naturally in 5th gear, going 3,000 rpm, making the engine work not as hard as it would in 3rd gear going 5,000 rpm, you will optomize your mileage by going in 5th gear whenever possible, thus making your engine work less hard thus saving gas.
Thanks hotshot. I tested my mpg by trying to drive on one tank full as "easy as possible" shifting to 5th around say 40mph+ (all in town driving).... amazingly, I got a whopping 0.3mph increase vs. a full tank of "normal driving" (....mix of 4th/5th gear cruises at 40+mph) and an occasional romping on it---for a taste of Rice-er-Roney).

I do all city driving (granted quite a few lights to stop at in town)...and averaged from 15.8 when new and as I just turned 3500mi on the odometer... now 16.2mpg! Ouch.

I didn't buy my stang for gas mileage, but I see GTers with 19mpg city and wonder -- what's the secret....In the interim, I'll be looking for those declines in the road, drive in a taller gear, put er' in neutral ahead a few miles in front of the intersection, maybe a push-start of two and jump in .....LOL......

Also, don't know (doubt it) if related, but I just installed GTA axle-backs and did notice (maybe I'm losing my mind here) a little less grunt off-idle and also in the lower rpms.... who knows, maybe it's the heat here in Texas!! OR - maybe its about time for CAI+tune Yeah, that's it, more air more efficiency in mileage...
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Unread 05-09-2007   #9 (permalink)
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If I dont do fast starts and keep the rpm at around 2500-3000 rpm I get 19-21 mpg around town and 25.5 on the hiway at 72 mph. I only have 9000 miles on her now.
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Unread 05-10-2007   #10 (permalink)
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Quote:
Originally Posted by napalmbomb View Post
If I dont do fast starts and keep the rpm at around 2500-3000 rpm I get 19-21 mpg around town and 25.5 on the hiway at 72 mph. I only have 9000 miles on her now.
Never thought I'd care that much about mpg, but given the wonderful prices we're charged at the pump now....... I don't know, the most I've ever gotten was 16.4mpg in town and man, that was going real, real, easy on her..... so may speak to the dealer next time I bring it in...who knows...

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Unread 05-10-2007   #11 (permalink)
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Quote:
Originally Posted by stlwagon View Post
Absolutely 5th gear. No reason to run 4th on the hwy unless you're in the hills.
I second this statement wholeheartedly. The whole reason auto manufacturers went to 5 (and 6) speed trannies is for fuel efficiency. On long cruises at freeway speeds of 60+ mph, the highest gear (5th in this case) is the most fuel efficient. If you hit mountians, drop to 4th, otherwise stay in 5th.
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Unread 05-10-2007   #12 (permalink)
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I go to 5th as often as I can as well... I drive the highway to work all the time.. speed limit is 65 I am always in 5th... I forgot the other day to go to 5th adn I kept wondering why it was revin' higher and then I realized I wasn't in 5th... no need to make the car work any harder than it needs to
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Unread 05-10-2007   #13 (permalink)
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To lazy to read all of the posts but ive seen 27 on the high way and i get any where from 6-9 intown.... I LOVE CENTRIFUGAL my Mileage went up even with 3.90s
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Unread 05-10-2007   #14 (permalink)
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Quote:
Originally Posted by tact_out View Post
To lazy to read all of the posts but ive seen 27 on the high way and i get any where from 6-9 intown.... I LOVE CENTRIFUGAL my Mileage went up even with 3.90s
Wow, I'll stop my gas mpg "whining" of a mere 16mpg in town immediately. Reading your post made me feel better at the pump -- but not at a green light sitting next to you LOL.... 545+rwhp...wow... please keep us all appraised of your many kills!
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Unread 05-10-2007   #15 (permalink)
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Well as of right now my kill list is a 20psi turbo srt4, z06, procharged c6, Lambo mariceolargo, supras and a few other ricers. I get beat by my mechanics Terminator and i got beat by an ENZO but im going to boost it to 680RWHP soon im going to LT's ( i have stock exhaust now) 16lb pully and stage III cam... so gas should be nice
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