Posts: 99
Joined: 1/13/2006 From: Honloulu Hi Status: offline
I wish I was getting those MPG figures. I get 18-19 using the dash indications with an average speed of about 28 MPH. When I made a cross country trip earlier this year I got 24.6 on the computer with a 26.3 hand calculated average, this was with an average speed of ~70MPH.
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Vista Blue 2006 GT Tinted Windows C&L CAI Diablo Sport Tuner 93 Tune Polished Valve Covers SLP LM Exhaust Hurst short shifter BBK LT and Catted X-Pipe
I finally started going slow enough to try and get better gas mileage. Just driving slower and letting everyone pass me has made a huge difference. I used to average 12-14mpg city and some highway. I used to speed a lot and race all the time. Now I slowly take off from stop lights and don't go over 70 on the interstate. It really gets me to where I'm going no faster than when I speed. Since traffic always slows you down eventually. I'll have to start using the cruise control though and see if that helps..think my computer says I'm getting like 22 mpg now.
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07 Black GT manual 3.55 gears C&L intake Evo tune MGW short shifter 14' shorty antenna 5% Limo Tinted windows, front turn signals, rear side markers
Posts: 246
Joined: 4/13/2008 From: Calgary, AB Status: offline
Jeeze I gotta slow down a bit. I think the last time I hand calulated mileage I got like 18-19 (Mix of nice driving and fun driving, basically all city). Of course, I can hardly say I get any highway mileage, because there are no properly driven highways here. The Deerfoot is the only one in Calgary without out traffic lights and it is basically rush hour all the time. It goes from 2 lanes to 5 lanes to 3 lanes, etc and nobody knows how to merge...
Anyhow nice right up. My goal is to get at least 21 with a decent mix of nice and/or fun driving. We'll see what happens.
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"Vanessa, Our Lady of Blessed Acceleration" -07 Vista Blue GT -JBA Axle-Backs on the way (4-6 weeks in order to save $50 shipping... bleh)
MPG'S always seem to come up in this forum.....i have heard everything from 35 mpg to 21 mpg.......did anyone buy a gt for gas mileage? i must say that the mpg are good on the s197 gt....actually, i am pleased that mine gets around 20 on average...i don't go by what the computer says...i use the mathematical way.....you can coast down a colorado hill and the computer will say 40 mpg!!!!! point is, these crazy 30 mpg posts are false, unless they lost 4 cylinders or drove down a mountain in neutral.......if you bought american muscle, drive it and IMO don't share your gas mileage data...share your time slips
ORIGINAL: 1morepart.......if you bought american muscle, drive it and IMO don't share your gas mileage data...share your time slips
Also I like your dog. I've got a black and white one. Coasting down a hill will not give you your average. From what I understand, you have to atleast have driven 5 miles after a reset to get a new average.
So as you can see you are talking about 1 mile per gallon different on highway, i would assume like me most people's driving is not all highway either.
Do I believe them, hell yes, I went from having a 2007 manual to a 2008 automatic and here are my findings, keep in mind my manual had 3:55 gears which probaly is why i got less highway miles. Both cars where done with 18 inch stock tires, and CAI. All these figures have been calculated with my normal driving habbits, city is mostly tooling around alexandria, VA/DC area with alot of traffic and stop and go lights.
Highway I calculated by going from VA to East End of Long Island every three months, trip is 330 miles one way, driving mostly around 75 probaly 80% of the trip. Also note the highway miles I have listed below are not true highway, they were measured on the trip where probaly 90% of the trip is highway, 10% is going through toll boths or dealing with traffic at the beginning of DC when i leave and hitting NY and going on I278 which even at 2AM has some traffic but no stop and go.
2007 manual 15 City 22 highway computer calculated. (well broken in, over 9000 miles on car) 2008 Auto 15 city 24 highway computer calculated. (did my first trip with 1300 miles on car)
With both cars, just my normal daily driving locally of a mix of mostly city with about 10% highway I am averaging 17 and sometimes 18 MPG.
One other thing I have noticed about stick drivers, they usually get worse gas mileage for two reasons, one stick is more fun to drive, you are more tempted to race through the gears. Also I know alot of people that can drive stick, just not as efficient as they should be so in the long run they get worse gas mileage then an automatic.
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ORIGINAL: Whistle
More suggestions, lose weight and drive a manual tranny...
Cold air does give you more power, but the extra drag due to higher density air is more of a detriment to your gas mileage, than the benefit the extra power provides. Below 55 mph aerodynamics aren't much of a factor, above 55 mph aerodynamics become a much larger factor.
Yes I'm a mechanical engineer, and yes I design vehicles for a living.
Most of the other stuff is good.
< Message edited by siggy14 -- 5/11/2008 10:43:23 AM >
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2008 Black GT Convertible Interior Lighting Cloath Top Sirius Interior Upgrade Package 18 Inch Polished Bullits Comfort Group Vipor Alarm-Remote Start/Mobile Angel GPS Recovery.
I bought a GT/CS in October of last year. I have only added a Granatelli CAI and use Mobil 1 oil. I didn't add the CAI until about a month after owning it and didn't start using Mobil 1 until I hit 6000 miles. I have been driving it a lot because I have been fixing up my home to sell and that is 125 miles from where I'm at now. The first 2 months I got around 25 mpg but I didn't pay much attention on how I was driving.
It seems to have slowly gotten better gas mileage over time. Partly to me driving around 60 mph on the interstate on that 125 mile trip each time I go. I get right around 30 mpg at that speed with maybe 5% of that trip being city driving. When I go 70-75 mph the gas mileage cuts back to about 25 mpg. I honestly think it would be lower if I didn't have the CAI and Mobil 1 oil. But the main thing is how I drive. The main point is, yes, I do get 30 mpg in my V8 Mustang on trips over 100 miles mostly on interstate.
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Ride in style 2008 Dark Candy Apple Red Mustang GT California Special Granatelli Cold Air Intake
When I do my 125 mile trip back to fix my home up to sell, I floor it to get off the ramp to the interstate just so I can blow it out and not have the engine running at the same rpms for so long. I must say, I do love how it feels and sounds when I floor it. And if I turn off traction control it gets a lot longer fishtail shifting from 1st to 2nd.
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Ride in style 2008 Dark Candy Apple Red Mustang GT California Special Granatelli Cold Air Intake
Posts: 2344
Joined: 10/13/2006 From: WEST LOS ANGELES Status: offline
All I know is that I should be getting better gas mileage with the blower but now that I have it I get on it because seems like every a$$hole on the road in LA thinks they can take you. But I gladly spank them every time. Yesterdays kills: G35 coupe and Carrera S and Civic SI.
My cruise control won't activate below 30mph and in Dallas you can't go really fast (like 30 mph) on the freeways during rush hour (rush hour is from 5am-10am). My legs get a workout between the shifting and braking when driving on the highway.
My wife and I just took a weekend trip from near Philly to near Boston. 685 miles, about 15% of which was not highway miles. Car went from just under 1000 miles to not quite 1680. 28.2 gallons total, with the initial fill-up Friday afternoon and the last one this morning at the same pump at the same station. That's 24.2 or a little more mpg, calculated, overall. The last 310 miles or so were nearer to 25 mpg (about 12 gallons used, but different stations/pumps and likely a different final fill level than the next-to-last one). I was making a little attempt at making good fuel mileage, as I wanted to make the whole 325 miles or so one way on one tank. But no special effort. My two somewhat lighter V6 cars of 2.5 and 3.0 liters have been barely 5 mpg better than that at the best of times.
My car has the FRPP cold air & tune, 3.55 gears, 235/50 tires and a manual tranny. Highway speeds mostly ranged from an indicated 60 to about 80 but mostly 68 - 72. I did get on it from time to time (from toll booths, on entrance ramps, as a demonstration for my Dad's benefit, and a few of other times). NO CRUISE CONTROL USAGE WHATSOEVER. All you really need is a steady foot and the ability to work with the traffic flow instead of fighting it all the time. Patience and looking further ahead than just over the hood line.
I'm not disagreeing with the idea that cruise control can improve fuel mileage. Just opening up the notion that it isn't a universal answer, nor should it be. It still requires driver situational awareness.
People who are "set-it-and-forget-it" drivers tend to run up on the rear bumpers of vehicles in front of them. When the cruise goes into 'accelerate' mode and there is a large difference between the current speed and the set speed it won't be any better than a human driver (and may not be as good depending on how fast it is programmed to resume the speed). In some cars that I've driven, cruise tends to overshoot going over the crests of hills. The human is sometimes able to do a better job in these situations.
On curves, most cars are slightly more stable with a little "leading throttle", or just enough to be accelerating a tiny bit (traffic permitting). My lifetime experience with cars that are cornered hard as the opportunities present themselves, anyway.
Edit: I found that the "gallons used" dash display was within about 5% of what the first refill took, which is probably within the range of error in self-service refill level vs the station attendant's original fill (no self-service in NJ). 12.6 gallons per the computer vs 13.2 actual.
Posts: 4140
Joined: 4/6/2005 From: West Los Angeles Status: offline
quote:
Coasting down a hill will not give you your average. From what I understand, you have to atleast have driven 5 miles after a reset to get a new average.
No, the car's computer readout shows a new average as soon as you hit RESET. How else do you think I got this?
It's from going downhill for about 20 minutes, barely using the gas pedal. Of course once I was back on the flatlands it wasn't as much fun watching it drop! I've been able to keep it at 19.8 mpg with 70/30 highway/city driving but if I do just one trip about 7 miles of just city driving it will drop to 19.7.
Printable Version
RE: Fuel Milage Help.............Maybe - 
RE: Fuel Milage Help.............Maybe - 
