i would really like to improve the gas mileage on my car. im certain i might get 21 at best around the city and 26 highway. i still have 2:73s still on plus with the basic tune up. now im slapping in a o/r h-pipe and hopefully that increases my mileage a bit due to that the cats are choking up air. i heard pulleys would improve mileage as well. tires are set at 32 psi in the front and 35psi in the rear. 1 of my friends told me that by putting draglites would help also due to that they dont have alot of weight to spin once rotating. i know on our motors we are able to switch octanes around. im just thinking of ways of getting good mileage in addition with 3:73s compared to todays V8s
gas mileage
- Thread starter tstang21
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mustang6tee8
Member
i have 3.73's with a 5 speed and it's really hard to get over 18-19 city/22-23 hwy. stick with the 2.73's...
mustang6tee8
Member
well... when i drive it reeeal easy i can get 19 in the city. i shift around 2200-2300 to get that, and it gets boring lol (especially since i just put UD pulleys on!). it is definately attainable though if you're dedicated enough. i might be able to squeeze 23 highway if i drive 60-65 but i hate going that slow when the speed limit is 70.
desertcox05
New Member
stprorolla49
Active Member
i drive less than 6 miles a day. school and work are both around the corner. i shift at around 1500 rpms when in the city. i dont care on going fast on the street only if im in a hurry. i just cruise and hear my flowmasters. i know a guy that has 4:10s and still gets 21mpg in the city. he says that its all on your foot and taking control yourself from getting a rush. so has to be plenty of ways on getting more mpg out of our motors
Stanger007
Founding Member
Here's some thinking in a different direction...
There is more to be had in the tune by advancing the spark during cruise and playing with the deceleration fueling. You could probably also force open loop and run it a tad leaner at cruise. Could also fiddle with the O2s switch point and have them biased towards a leaner mixture.
Wes
There is more to be had in the tune by advancing the spark during cruise and playing with the deceleration fueling. You could probably also force open loop and run it a tad leaner at cruise. Could also fiddle with the O2s switch point and have them biased towards a leaner mixture.
Wes
DDSTANG94
New Member
DDSTANG94
New Member
dude try shifting between 2200-2500 rpms....when u shift that low (1500) your rpms drop to much between shifts and with 2:73 gears u have to really give it some juice to get that heavy car moving......
and i think with CITY driving its a misconception that 3:73 gears will make u get poor gas millage.....i think they help are heavy cars get moving better so u dont have to use the gas pedal so much....rather u let the extra torque the gears will make to get u moving.....
like i said i seen no difference im mpg with 3:73 gears expect for on the highway...really in the city ur not at any higher of a rmp then u were before just a gear higher than u were before...exaample.....stock 2:73 gears at 30 mph in 3rd gear is at about the same rmp as 3:73 gears at 30 mph in 4th gear....see what im saying???
I'm not sure that you can expect any mpg miracles. Driving style has more to do with it then any of your mods. Removing your cats might not be such a good idea. The cats provide backpressure that helps your low end power. I would suspect that if you removed them you would benefit in the upper rpm range at the expense of your lower rpm range. I would think that you want as much low rpm power for gas mileage.
Personally, I have come to grips with lower gas mileage because I love the song that my V-8 produces!!
Personally, I have come to grips with lower gas mileage because I love the song that my V-8 produces!!
Black95GTS
Active Member
Replace your fuel filter, coil, plugs, wires, air filter, tire pressure at what it says on the side of the tire, clean your MAF, clean your IAC, run sea foam through the engine, injector cleaner, just make sure everything is tip top.
Ditching the stock cats will improve mileage. Running lighter tires will also improve mileage, as will running an aluminum drive shaft. Any time you eliminate rotating mass from your car it will pay dividends in the mileage department. You could also ditch power steering for a manual rack, ditch the AC, ditch the EGR... lose ANY extra weight. Even drive around with a less then full tank. Rear seats... who needs 'em?
Adam
Ditching the stock cats will improve mileage. Running lighter tires will also improve mileage, as will running an aluminum drive shaft. Any time you eliminate rotating mass from your car it will pay dividends in the mileage department. You could also ditch power steering for a manual rack, ditch the AC, ditch the EGR... lose ANY extra weight. Even drive around with a less then full tank. Rear seats... who needs 'em?
Adam
yup basically 1500 rpms or 2000 is where i shift at. once i get my o/r h-pipe in, ill shift a bit higher cause of the sound of flows 
. i did basically everything except for changing fuel filter, fuel injection. weight is the enemy on our cars
oh btw...i gotta have seats if you know what i mean
. i did basically everything except for changing fuel filter, fuel injection. weight is the enemy on our carsoh btw...i gotta have seats if you know what i mean
Ditching the cats will not improve gas mileage. Ditching the EGR will give you driveability problems. Removing backpressure from your exhaust shifts your power band to a higher rpm which means you have less hp at the lower rpm ranges. Lower end hp is what you want for fuel mileage! I ran an off-road h-pipe for a while and finally ditched it for a BBK catalytic x-pipe. The offroads made the car very loud with the factory mufflers/factory headers. I couldn't imagine the noise it would make with flowmasters on it! Bottom line: Removing your cats helps your upper rpm power band and will hurt your lower end.
Removing friction, rotating mass, drivetrain weight and accessory drag are all excellent ways to make your car more efficient. Disconnecting your A/C is not a good idea since your A/C is used when you turn on your defroster. The A/C compressor has a clutch that allows the compressor pulley to spin without spinning the compressor when the A/C is off. Unless you are looking to ditch weight, I would advice against ditching the A/C. Your rack and pinnion is designed for power assist as is the rag joint in your steering column. In order to properly deactivate your power steering you would need to get a manual rack and a stronger steering joint/shaft (ie: flaming river).
How much money do you plan to spend to safe money?? Off road pipes - $100, lighter tires - $400 to 600, aluminum drive shaft - $120...why not just leave the car alone and use the $800 to $1200 bucks to supplement your fuel bill? Will you get that money back in fuel savings?? Just a few things to think about!
removing the cats would help top end but i dont think it would effect anything in the low end. theres less restriction in the exhaust and nothing clogging the airways. as for removing the egr, i didnt experience any drivibility problems. i would agree that reducing rotating mass would would be a benefit as well not allowing the car to push extra energy.
more energy = more gas being dumped
we could do this guys, lets dont those oil companies all our $$$
more energy = more gas being dumped
we could do this guys, lets dont those oil companies all our $$$
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