Gas Milage question (not what you think)

Jaysin · 06-19-2003, 08:51 AM

Yes, I know our gas milage sucks, My buddies bored out 350 (5.7 ltr) gets better millage than I do (he gets like 25-27 MPG) I have a 3.4 ltr 6 cyl... and his car is like 1000 pounds heavier...

After replacing my plugs with some NKG 2 prongs.. I'm finally getting about 22-23 MPG I was at about (18-20). I replaced wires and everything. I drive it sensible, I do get on it occasionally when I need to.

My question is (yes I'v done a search here) what is the main factor governing our poor millage? I have a K&N drop in filter. I was thinking of modifing the ram air box to actually provide cold air... why is it sitting on top of the radiator?? And make the ram air box less restrictive, that ram air.. what a joke. What other mods would someone advise me doing? My 2.4 Ltr 98 GAGT got 35+ MPG... Id like to be at 25 or so with this car. Is it possible??

Thanks!

-Jay

06-19-2003, 09:05 AM

eh? spark plugs provided a 4mpg increase??

my 99 se v6 averages 22-25mpg and that includes my nightly run to 100 on my way home from work.

dearim · 06-19-2003, 09:40 AM

My 2000 GT gets at worst 21.5mpg and the best I've gotten since I bought the car back in September is about 25mpg.

I'd love to get 4mpg more just by changing plugs, but I don't think it's gonna happen.

06-19-2003, 09:58 AM

Swap in a 3800?

I regularly get 30-32 MPG with my GT, it was one of the factors in buying a GP over a GA this time.

06-19-2003, 10:02 AM

Quote:

Is it possible??

Sure it is. First thing, and this makes a huge differnce, Gearing. Your buddies V-8 probably has a numerically lower number final drive than you do. At 70 MPH, what RPM are you turning? What RPM is he turning? An GA SE will get better gas mileage than a GT because of gearing.
The other big think, slow down.

Jaysin · 06-19-2003, 11:04 AM

Ok, numerically lower gear ratios, makes sense to me. The only tranmission work I'v done was a rebuild of a 85 dodge aries tranny... are there aftermarket parts to change these ratios? @ 75MPH Its probably somewhere from 2500 to 3000 RPMs.. I dunno what his would be.

-Jay

Jaysin · 06-19-2003, 11:13 AM

Quote:

Originally posted by dearim
My 2000 GT gets at worst 21.5mpg and the best I've gotten since I bought the car back in September is about 25mpg.

I'd love to get 4mpg more just by changing plugs, but I don't think it's gonna happen.

It did... =) no.. hehehe One of the plugs.. all original from the factory, one of them in particular was fouled to all hell and I think perhaps it may not have been fireing 100% of the time, hence the reason I thought I do a plug change. This is on a 99 GAGT w/ 56K miles

-Jay

dearim · 06-19-2003, 12:17 PM

Well, yeah, that would do it.

koolZ71 · 06-19-2003, 12:30 PM

im suprised no one has said check the fuel filter yet..it is the main factor for poor gas mileage

eric99gt · 06-19-2003, 01:02 PM

that's what i was thinking. I regularly get at least 25 mpg and that's with alot of city driving....and a lead foot.

Jaysin · 06-19-2003, 01:44 PM

how hard is it to change the fuel filter? how long would it take? whats it involve? where the heck is it? =) yes I know.. dumb newbie questions... any special tools needed?

-Jay

Sprucegagt · 06-19-2003, 02:54 PM

Quote:

Originally posted by Jaysin
@ 75MPH Its probably somewhere from 2500 to 3000 RPMs.. I dunno what his would be.

-Jay

Are you sure about this? My GT only pulls 2250 RPMs at 75 MPH and 3000 RPMs at 100 MPH all while in overdrive!

eric99gt · 06-19-2003, 02:57 PM

search fuel filter.....the 2002's are fairly easy to change

my99gagt · 06-19-2003, 03:17 PM

is 22 or 23 mpg any good?

AznGA · 06-19-2003, 03:53 PM

Quote:

Originally posted by Dan00GPGT
Swap in a 3800? I regularly get 30-32 MPG with my GT, it was one of the factors in buying a GP over a GA this time.

What?
3800 gets better gas mileage than 3400?

06-19-2003, 04:04 PM

I average 26 in town and 31 on the highway. Sure I don't redline the car from every stop light, but I don't drive like grandpa either.

06-19-2003, 05:38 PM

oh yes the 3800 gets better gas milege. I went to our cottage in my mas gpgt ( becasue it has a hitch and i dont have one) and I got 30 mpg for the 80 mile drive. The next weekend I made the same trip in my car and only got 27 mpg.

AznGA · 06-19-2003, 08:18 PM

Do you all realize that GA's gas tank is really really small? It's only like 13 gallons.

Mike Jung · 06-19-2003, 08:45 PM

Quote:

Originally posted by AznGA
Do you all realize that GA's gas tank is really really small? It's only like 13 gallons.

My '99 GA has a 15 US gallon/56.8L gas tank.

The current '03 GA's have a 14.1 US gallon/53.4L gas tank.

Slim · 06-19-2003, 09:58 PM

Quote:

Originally posted by Mike Jung
My '99 GA has a 15 US gallon/56.8L gas tank.

The current '03 GA's have a 14.1 US gallon/53.4L gas tank.

My '02 GA has the 53 litre tank and I don't think I've ever put more than 48 litres in it.

I did a trip to Ottawa over the 2-4 and I got 535 out of 47 litres.

That's 8.78l/100K or just around 27mpg.

06-19-2003, 08:51 AM	#1
Jaysin GAGT - Member Join Date: Dec 2002 Location: Kirkville, NY Posts: 40 Vehicle: 1999	Gas Milage question (not what you think) Yes, I know our gas milage sucks, My buddies bored out 350 (5.7 ltr) gets better millage than I do (he gets like 25-27 MPG) I have a 3.4 ltr 6 cyl... and his car is like 1000 pounds heavier... After replacing my plugs with some NKG 2 prongs.. I'm finally getting about 22-23 MPG I was at about (18-20). I replaced wires and everything. I drive it sensible, I do get on it occasionally when I need to. My question is (yes I'v done a search here) what is the main factor governing our poor millage? I have a K&N drop in filter. I was thinking of modifing the ram air box to actually provide cold air... why is it sitting on top of the radiator?? And make the ram air box less restrictive, that ram air.. what a joke. What other mods would someone advise me doing? My 2.4 Ltr 98 GAGT got 35+ MPG... Id like to be at 25 or so with this car. Is it possible?? Thanks! -Jay

06-19-2003, 12:30 PM	#9
koolZ71 walkin' tall AKA: nathan Join Date: Aug 2002 Location: laura, Ohio Age: 41 Posts: 1,522 Vehicle: 04 colorado<>93 SHO	im suprised no one has said check the fuel filter yet..it is the main factor for poor gas mileage __________________ JACOB HECK 7-03-82---07-29-01 I will miss u baby brother formaly koolgt

06-19-2003, 01:02 PM	#10
eric99gt just go for it AKA: Eric Join Date: Sep 2002 Location: Houston, TX Age: 39 Posts: 1,505 Vehicle: 1999 Grand Am GT Sedan	that's what i was thinking. I regularly get at least 25 mpg and that's with alot of city driving....and a lead foot. __________________ Check the rig out here. http://rankmyride.com/?page=cars/view&CID=250 Check out my Interceptor digital scan tool

06-19-2003, 02:57 PM	#13
eric99gt just go for it AKA: Eric Join Date: Sep 2002 Location: Houston, TX Age: 39 Posts: 1,505 Vehicle: 1999 Grand Am GT Sedan	search fuel filter.....the 2002's are fairly easy to change __________________ Check the rig out here. http://rankmyride.com/?page=cars/view&CID=250 Check out my Interceptor digital scan tool

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06-19-2003, 09:05 AM	#2
illudium Guest Posts: n/a	eh? spark plugs provided a 4mpg increase?? my 99 se v6 averages 22-25mpg and that includes my nightly run to 100 on my way home from work.

06-19-2003, 09:40 AM	#3
dearim Casual Car Nut AKA: Michael Join Date: Dec 2002 Location: Utah Age: 47 Posts: 228 Vehicle: 2012 Ford Focus SEL	My 2000 GT gets at worst 21.5mpg and the best I've gotten since I bought the car back in September is about 25mpg. I'd love to get 4mpg more just by changing plugs, but I don't think it's gonna happen.

06-19-2003, 09:58 AM	#4
Dan00GPGT Guest Posts: n/a	Swap in a 3800? I regularly get 30-32 MPG with my GT, it was one of the factors in buying a GP over a GA this time.

06-19-2003, 11:04 AM	#6
Jaysin GAGT - Member Join Date: Dec 2002 Location: Kirkville, NY Posts: 40 Vehicle: 1999	Ok, numerically lower gear ratios, makes sense to me. The only tranmission work I'v done was a rebuild of a 85 dodge aries tranny... are there aftermarket parts to change these ratios? @ 75MPH Its probably somewhere from 2500 to 3000 RPMs.. I dunno what his would be. -Jay

06-19-2003, 12:17 PM	#8
dearim Casual Car Nut AKA: Michael Join Date: Dec 2002 Location: Utah Age: 47 Posts: 228 Vehicle: 2012 Ford Focus SEL	Well, yeah, that would do it.

06-19-2003, 01:44 PM	#11
Jaysin GAGT - Member Join Date: Dec 2002 Location: Kirkville, NY Posts: 40 Vehicle: 1999	how hard is it to change the fuel filter? how long would it take? whats it involve? where the heck is it? =) yes I know.. dumb newbie questions... any special tools needed? -Jay

06-19-2003, 03:17 PM	#14
my99gagt yep Join Date: Sep 2002 Location: Springfield, Illinois Age: 36 Posts: 223 Vehicle: 99 black gagt coupe	is 22 or 23 mpg any good?

06-19-2003, 04:04 PM	#16
bowl37 Guest Posts: n/a	I average 26 in town and 31 on the highway. Sure I don't redline the car from every stop light, but I don't drive like grandpa either.

06-19-2003, 05:38 PM	#17
2000GA Guest Posts: n/a	oh yes the 3800 gets better gas milege. I went to our cottage in my mas gpgt ( becasue it has a hitch and i dont have one) and I got 30 mpg for the 80 mile drive. The next weekend I made the same trip in my car and only got 27 mpg.

06-19-2003, 08:18 PM	#18
AznGA GAGT - Junkie AKA: YJ Join Date: Nov 2002 Location: Midwest Posts: 4,440 Vehicle: GAGT	Do you all realize that GA's gas tank is really really small? It's only like 13 gallons.