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I need better MPG. Any advice?
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wheelieking
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PostPosted: Fri Oct 08, 2010 6:44 am    Post subject:  I need better MPG. Any advice? Reply with quote

I am working third and going to college in the day so to save us some money my wife and I have switched vehicles. Now she is driving my Trailblazer and I have the Impala. The car is an 01 with a little more than 130k on it. I have changed the plugs and wires about 30k ago and I keep up on general maint very well ie; oil changes, fuel filter, air filter.... It had the cat changed under warranty at around 70k. So my issue is this car when we bought it (used) it got 27 highway. Now it gets 24. So what mods or other maint can I do to improve this?

BTW I ordered an L26 intake and plan to change the LIM when I swap this because I have goop in the coolant. Could this be my main cause?


I just realized I forgot to mention it is a series 2 3.8
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habermehl
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PostPosted: Fri Oct 08, 2010 7:50 am    Post subject:  Re: I need better MPG. Any advice? Reply with quote

wheelieking wrote:
I am working third and going to college in the day so to save us some money my wife and I have switched vehicles. Now she is driving my Trailblazer and I have the Impala. The car is an 01 with a little more than 130k on it. I have changed the plugs and wires about 30k ago and I keep up on general maint very well ie; oil changes, fuel filter, air filter.... It had the cat changed under warranty at around 70k. So my issue is this car when we bought it (used) it got 27 highway. Now it gets 24. So what mods or other maint can I do to improve this?

BTW I ordered an L26 intake and plan to change the LIM when I swap this because I have goop in the coolant. Could this be my main cause?


I just realized I forgot to mention it is a series 2 3.8


the tune up would have given you the worse milage (air filter and plugs ) because its pure and burning gas better its good for your car but not milage.

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billy101 wrote:
Conner wrote:
how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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davidhoutz
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PostPosted: Fri Oct 08, 2010 8:07 am    Post subject:   Reply with quote

I have the same car with 166,000+ miles on it and I have more weight in my car as well and I still get around 31 mpg on the highway. Put a warm air intake on it. That made about a 3-4 mpg diff on mine. Make sure the tires have the right amount of air. I seafoam the car about every six month's. And I use 87 Octane, any higher and I get worse mileage. Just some simple tips.
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bbengineer
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PostPosted: Fri Oct 08, 2010 8:08 am    Post subject:  Re: I need better MPG. Any advice? Reply with quote

habermehl wrote:

the tune up would have given you the worse milage (air filter and plugs ) because its pure and burning gas better its good for your car but not milage.


That's absolutely ridiculous and incorrect... the better the burn the better the mileage


What brand of plugs and wires did you use? If you didn't use AC Delco, your mileage can suffer.

Have you cleaned your MAF, Throttle Body and IAC?

How about your FPR... could it be leaking slightly?

As far as the L26 Upper... it shouldn't change your mileage, but you will need a throttle body adapter plate (same as the GenV blower adapter) to mate the L26 Upper to the L36 Throttle Body

BBEngineer

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guinnessfan
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PostPosted: Fri Oct 08, 2010 9:13 am    Post subject:   Reply with quote

Hot air intake.
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habermehl
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PostPosted: Fri Oct 08, 2010 9:23 am    Post subject:  Re: I need better MPG. Any advice? Reply with quote

bbengineer wrote:
habermehl wrote:

the tune up would have given you the worse milage (air filter and plugs ) because its pure and burning gas better its good for your car but not milage.


That's absolutely ridiculous and incorrect... the better the burn the better the mileage


What brand of plugs and wires did you use? If you didn't use AC Delco, your mileage can suffer.

Have you cleaned your MAF, Throttle Body and IAC?

How about your FPR... could it be leaking slightly?

As far as the L26 Upper... it shouldn't change your mileage, but you will need a throttle body adapter plate (same as the GenV blower adapter) to mate the L26 Upper to the L36 Throttle Body

BBEngineer


just goin by what my mechanic told me? new air filter and plugs burning more.....

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billy101 wrote:
Conner wrote:
how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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bbengineer
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PostPosted: Fri Oct 08, 2010 9:24 am    Post subject:  Re: I need better MPG. Any advice? Reply with quote

habermehl wrote:

just goin by what my mechanic told me? new air filter and plugs burning more.....


Find a new mechanic... he's wrong

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habermehl
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PostPosted: Fri Oct 08, 2010 9:27 am    Post subject:  Re: I need better MPG. Any advice? Reply with quote

bbengineer wrote:
habermehl wrote:

just goin by what my mechanic told me? new air filter and plugs burning more.....


Find a new mechanic... he's wrong

BBEngineer


lol

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billy101 wrote:
Conner wrote:
how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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impalafirst
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PostPosted: Fri Oct 08, 2010 10:04 am    Post subject:   Reply with quote

Winter gas is coming. My mileage drops like a bomb during winter. Has your gas station started using the winter blend already maybe?
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PostPosted: Fri Oct 08, 2010 10:25 am    Post subject:   Reply with quote

Check your tire pressures. As it gets colder, your tire pressure drops more, 10 deg = 1 psi. Low tire pressure = poor mpg. Get those back up.

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habermehl
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PostPosted: Fri Oct 08, 2010 11:15 am    Post subject:   Reply with quote

impalafirst wrote:
Winter gas is coming. My mileage drops like a bomb during winter. Has your gas station started using the winter blend already maybe?


theres a different blend? never heard of this?

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billy101 wrote:
Conner wrote:
how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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whitelightnin04MC
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PostPosted: Fri Oct 08, 2010 11:26 am    Post subject:   Reply with quote

Absolutely.

http://auto.howstuffworks.com/.....-fuel1.htm

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PostPosted: Fri Oct 08, 2010 12:13 pm    Post subject:   Reply with quote

whitelightnin04MC wrote:
Absolutely.

http://auto.howstuffworks.com/.....-fuel1.htm


wow you learn something new everyday i cant believe that ive never heard of that?

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billy101 wrote:
Conner wrote:
how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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wheelieking
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PostPosted: Fri Oct 08, 2010 2:20 pm    Post subject:   Reply with quote

Well I am not sure about the fuel but I dont think that is my issue because I have been checking it using the trip meter since early august cause thats when the fuel gauge stopped working. I fixed that last week btw. I did use AC plugs but not sure on the wires but I definitely did NOT buy the junk auto zone wires. I used them once in high school I cant believe they are allowed to sell that crap!


Warm air intake? How would I accomplish that?

Oh one more fact / question. My county does not have emissions so I could remove the cat if I wanted. So would freeing up the exhaust help? U bend delete maybe. You her it on the ads all the time but has anyone documented it?

BBE what is an FPR? and yes I cleaned the throttle body but it was a long time ago so I should do that again. Thanks for reminding me of that. Where can I get the adapter you mentioned?

Thanks everyone. Keep the tips coming.
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PostPosted: Fri Oct 08, 2010 3:19 pm    Post subject:   Reply with quote

Just some advice before you start trying to play with too much and spending a lot of money to save a couple bucks.

If gas is 2.50 / gallon and you get 25 mpg you are paying $0.10 per mile. At 28 mpg, you are averaging ~ $0.09 per mile and 31 mpg, you are averaging $0.08 per mile.

If you get to a sustained 31 mpg, then you've only saved $20 over 1000 miles over your costs at 25 mpg. It would take 10,000 miles to save $200 if you even got to 31 mpg. If you only get to 28 mpg, then you'd save $100 over 10,000 miles.

Outside of maintenance you should be doing, spending much money on mods to increase your efficiency is a losing proposition.

Gas would have to be $4 / gallon, to even save $300 over 10k miles with an increase from 25 mpg to 31 mpg.

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