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Old 08-10-2013, 02:33 AM   #11
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According to the on board computer, which I have compared against the fill up receipt, At 58 mph (which is my best fuel economy) I get about 35-42mpg. My michelins are at 36lbs psi, I use synthetic oil with Lubegard engine treatment and Napa gold filter. I clean the throttle body occasionally with spray in TB cleaner. I also like to occasionally run chevron Techron concentrate to keep the valves clean with the 94 octane (non ethanol fuel) I find that if I switch to a lower grade fuel, bye bye to the good fuel mileage. New Iridium plugs, air filter, and plug wires keeps it well. I also recently pulled the IAC and cleaned it too. My trunk is always loaded with 75lbs of junk lbs too.
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Old 08-17-2013, 10:29 PM   #12
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Is the car going into OD (overdrive) at all? Is the torque converter kicking in between 45-55? There'* a possibility that could cause poor fuel economy issues as well.

I would also check the throttle body and make sure it'* clean, all vacuum lines are firmly connected and in good condition, a dragging caliper or maladjusted drum brakes (if applicable), partially restricted exhaust?

Believe it or not, my mom'* '99 Intrigue (3800 Series II) gets better fuel economy at 80 mph than it does at 65. The gearing in some of these cars is odd enough that, at speeds under 55, we get better mileage driving in 3 instead of D.

Another thing to check is the coolant temp sensor. A faulty CTS may not set a trouble code, but the ECM thinks the engine is cold all the time, and runs in open loop mode continuously, and when this happens the engine will run rich all the time.
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Old 08-18-2013, 06:58 PM   #13
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if you run a k&n filter check your maf sensor and if the wires are oily from the filter oil clean em off as that can cause the engine to run lean all the time. toss in a cts and that might really screw things up as it would not know what to do with itself. just a thought
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Old 08-19-2013, 08:46 AM   #14
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Replacing the air filter with a K&N (or any other so called performance air filter) on vehicles with fuel-injected, computer-controlled gasoline engines—such as those manufactured from the early 1980s to the present—or diesel engines does not improve fuel economy. Go check with K & N and they will agree.
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We certainly understand why it is theoretically possible for a consumer to experience a mileage increase after installing a K&N air filter or intake system, however, we do not go so far as to make a general claim that our air filters and intake systems will provide an increase in mileage.
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Definition of theory
Idea formed by speculation: an idea of or belief about something arrived at through speculation or conjecture
What many people don't realize and what many others simply forget to consider is that there is a throttle valve connected to your gas pedal that is constantly restricting the air flow into the engine. The only time it is not restricting the airflow is when it is at wide open (WOT). The throttle valve determines how much air enters the engine, and the engine computer (for fuel injected engines) determines how much fuel to mix with the air. Several factors influence how the computer determines this, but the result is basically the same: a fixed Air/Fuel Ratio will be supplied to the cylinders.

How to save Gas - 33 Tips
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Old 08-19-2013, 08:55 AM   #15
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more air = more fuel = more power = more speed
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Old 08-19-2013, 09:22 AM   #16
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Originally Posted by jwfirebird View Post
repeating the words of my father inlaw F'em. what people do around you is not your problem. but you were looking for issues and i think there are no mechanical issues, my father inlaw can get 30-32 mpg from a 96 bonnie thats been beat all its life your imp should be better in all areas. the speed and cruise arent good, neither are the tires. like he said you could get k&n drop in and i have had good luck with the e3 plugs as well. but the most effective thing at gaining mileage is one of those displays so you can see what the happy spot is speed wise. you can get torque or scangauge or any of those and display the mileage. looking at mine i can usually beat the cruise by 1 to 2 mpg. i thought about putting something in my wifes car but she wouldnt pay attention to it if i did so if its something like that i understand. she only gets 28 but i know the reason there too, she is constantly on the gas
ive used e3 plugs before and they were garbage within 4k miles. didnt increase fuel mileage.
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Old 08-19-2013, 09:26 AM   #17
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i assume that your vehicle is running good currently.its always good to check for vacuum leaks.if you have a scanner that will display live data. check your stft.use a high flow k&n air filter.I dont believe the cold air intake scam.as long as you have a good clean filter thats the best your going to do.good tire pressure and weight reduction.Also sounds like you need to shimmy up the gas pedal so it doesnt go as far to the floor. lmao
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Old 08-19-2013, 12:59 PM   #18
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ive heard people saying bad things about the e3'* not sure what thats about, but i wouldn't say anything unless i had tried them in at least three or four vehicles, because i take care of a few family members cars i have. everyone i have put the e3'* in has lasted longer than that person kept the car so i dont know exactly but given i had about 80k on the ones i had in my 3.4 monte before i sold it with not even a rough idle i would guess they would outlast the delcos that come in it.
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