my MPG is getting ridiculous..

[xxstarspyxx]

I have a 2002 v6 and It has 96k miles on it...city driving I get like 10-12....
Highway I get 17ish


Mods that might affect it;
285 rear 265 front.
Dual exhaust. Dumped

373 rear
And it hasn't gotten a tune up in a while..

And worst part is it supposedly has 24lb injectors....

But the prev owner told me it still only pumps the same amount of gas unless Its tuned to pump 24lbs..which isnt...

I'm thinking of getting a tune up, can you guys advice me what to tell the mechanic to change so I can get better mpg....
I also want to know what brand sparkplugs I should get to get for performance +mpg if that's possible....


Any advice Would help....also if you guys know a price estimate for all of this and any mechanics u guys Would advice in Westchester, Bronx area...


Any advice is appreciated
Thanks

 

[Blue_Slug]

I'm kinda getting crappy mpg too. My info screen says 11 avg mph like Wtf ? I have an 05 v6 with 18 inch rims an intake and flowmaster. Anyone got alive ? Btw sorry I can't help u out starspy

 

[Blue_Slug]

I'm kinda getting crappy mpg too. My info screen says 11 avg mph like Wtf ? I have an 05 v6 with 18 inch rims an intake and flowmaster. Anyone got alive ? Btw sorry I can't help u out starspy

mpg not mph.

 

[Wicked One]

Most causes of crappy MPG is the infamous lead foot

If the car has 24lb injectors and is not tuned for them then you will be sucking more fuel. A tune up is different than a tune.

Tune up= plugs, wires, coil pack etc.
Tune = reflash computer with a calibrated program for your mods (injectors) to make the car run more efficient and gain the most from the mods.

Good luck.


This is mine after driving 246 miles down to carlisle.

 

[AdirondackFox08]

It doesn't make any sense to me why the previous owner would put 24lb injectors in... Even with the gears, bigger tires, and the exhaust there is no reason to only be getting 17 on the highway. Is it a stick? Hell with my car I can drive it hard and still get 19 mpg.

Blue Slug, I would just calculate the mpg after you fill the car up with gas and see how many miles you went in that time. I wouldn't rely on the mpg calculator on the car to be correct...

 

[Wicked One]

^^^^Good point^^^

If there was no reason to upgrade, then just get some stockers and replace them.

If I drive my car hard i might get 5 or maybe 8 mpg Boost is great.

 

[NYstang]

Biggest change- RIGHT FOOT!!!


otherwise- what color are the injectors? Im curious to see if they area changed. Even if they are, find a set of stockers and put them in if you dont plan on getting a tune. They are useless alone, or even with boltons.

Get a tuneup- Just use Motorcraft parts(plugs, wires, fuel filter). Get a K&N air filter if you havent already, might as well. Also check tire pressure, and make sure your brakes arent dragging.


For reference, Im getting 19mpg city/26 highway with my 02 six/Auto with 255/315's, tune, and stock exhaust.

 

[Blue_Slug]

It doesn't make any sense to me why the previous owner would put 24lb injectors in... Even with the gears, bigger tires, and the exhaust there is no reason to only be getting 17 on the highway. Is it a stick? Hell with my car I can drive it hard and still get 19 mpg.

Blue Slug, I would just calculate the mpg after you fill the car up with gas and see how many miles you went in that time. I wouldn't rely on the mpg calculator on the car to be correct...

ill check that after driving back from Sundays cruise

 

[mach1]

I'm sorry fellas, but if your mechanic can't recommend what to change in a basic tune up that will help efficiency, I wouldn't take my car there. A custom tune will give you the most effiency with what you have after changing, plugs gas filter , etc. . But don't expect 30mpg. For that you buy a new V6.

 

[xxstarspyxx]

I wish i could exepct 30, im hoping for atleast 18 or 20 city,
And yeah i know Tune up and a Tune are different, i Am first getting a tuneup then maybe look into buying a SCT tuner,

Now my car maybe does have a 24LB injectors, is there anyway to find that out to be sure?
And does anyone know how much stock injectors +Installation would be?

 

[mach1]

do the basics. fuel filter, oil change, spark plugs. Put in a cold air kit. they flow better than the stock air box. If you already have a cold air kit, clean the filter with the K&N cleaner kit. You could put back the stock injectors. but get the car on the dyno first and have the fuel air ratio checked. It's cheaper than a tune just to check it. After it's all done, you can decide if you want a custom tune or not.Also gears will affect your MPG.

 

[CaptainChaos]

96K- possible bad O2? Any chance you have a cat going out? CEL? Also make sure your MAF is cleaned. A $4 can of CRC mass-air cleaner (gray label) can get it done. Clean the throttle body. Throwing ideas out...

I'm sure those wide tires are giving you more rolling resistance.

 

[AlloyGT07]

I have an 07 GT with a 255/285 set up, CAI + Tune, auto transmission, brand new spark plugs. On my drive to carlisle I got 21.4 MPG Usually on the highway I get around 20MPG. If I drive just in Brooklyn avoiding the highways I get about 13MPG... my overall avg is about 16MPG. I use an iPhone app at every single fill up and it calculated everything for me. Pretty neat.

 

[Kylejb2663]

Biggest change- RIGHT FOOT!!!


otherwise- what color are the injectors? Im curious to see if they area changed. Even if they are, find a set of stockers and put them in if you dont plan on getting a tune. They are useless alone, or even with boltons.

Get a tuneup- Just use Motorcraft parts(plugs, wires, fuel filter). Get a K&N air filter if you havent already, might as well. Also check tire pressure, and make sure your brakes arent dragging.


For reference, Im getting 19mpg city/26 highway with my 02 six/Auto with 255/315's, tune, and stock exhaust.

+1 with what Alex said!!!!! Big thing is to make sure brakes/e brake is not dragging...that's its correctly tuned and a good tune up.... I have an 05 gt that puts 471 HP w a supercharger and methanol injection... for mileage I see between 26 and 28 miles to the gallon on the highway in 6th gear...