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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-01-2005, 02:04 AM   #1
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Default gas mileage

Hey y'all, As my sig says I have made some mild mods to my Bonny.

Is it just my imagination or am I getting better gas mileage??
I know it sure seems like I am!!


Give me y'alls opinions.

Peace,
Tim
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Old 09-01-2005, 03:22 AM   #2
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Yes your milage should improve, your moving the air more efficently.
Thats if you can keep your foot out of it
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Old 09-01-2005, 02:54 PM   #3
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Speakin of gas mileage, I'm getting around 23 on average. That'* with mostly freeway driving. Does that sound right? I would like to see a little better but I realize it'* a big car.
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Old 09-01-2005, 05:14 PM   #4
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I get 23mpg and that'* around town with screwing around added in. I rarely get less than 22mpg to a tank no matter what I'm doing with the car. I actually got 28mpg last fall on a trip down to Atlantic City and back with 3 other guys in the car. I was very pleased and I can't wait to start modding up so I can see that number increase (when I can manage to keep my foot out of it!! ).

That'* the thing. With mods, comes more hp/tq and by increasing either or both of those, you increase your mileage at a certain point. If you drive normal, you'll see an increase in mileage, but if you just have to have that grin on your face all the time and keep stomping on it, then you may not see an increase in mileage, but you will get a wider grin
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Old 09-01-2005, 05:45 PM   #5
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Quote:
Originally Posted by hvactech
Speakin of gas mileage, I'm getting around 23 on average. That'* with mostly freeway driving. Does that sound right? I would like to see a little better but I realize it'* a big car.
Are you kidding! I get only about 18mpg and lately I've been getting 14.5mpg. But with the 14.5 use alot of throttle but I have gotten less. The worst has been about 12.5mpg, I can tell you that when I drove to San Francisco about 360 miles north I did get 21mpg but that was mostly freeway.
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Old 09-01-2005, 07:38 PM   #6
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I'm backing Swartlkk

Highway mileage with family lowest was 27.9, several in the 29-30 range. With the SC, the less hills the better the mileage. More so with a SC, than a non-SC car.

Around town 21-22 plus. I live in a small town with not much "cruising".. Patrick
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Old 09-01-2005, 08:03 PM   #7
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I live in a very small town (we have a stop light and a gas station - woohooo!), but most of my time driving "around town" is between my town and the next closest one, during which the speed limit is 55mph. If I'm on the back roads I typically run alittle faster and really carve through the twisties, but there are quite afew stop signs between my place and typical destinations (Wal-mart, Tops, BJ'*, etc.). I am very happy with my mileage for the type of driving and the roads I'm on. For comparison, my Bravada only gets 14-15mpg on the same trips. Now granted, I am positive that I have 2 lazy O2 sensors that are really fudging up the mileage good (my last autotap session with it confirmed this), but right now I don't have the money to fix it, so I drive it sparingly. It will be fixed before winter hits home no matter what happens.

IO, it definitelly sounds like there is something amiss in your engine/computer control somewhere. When was the last time you did a full tune up (plugs and wires)? Is your engine running good? My Bravada has what seems like surges in acceleration. I replaced the plugs, wires, cap and rotor and it did wonders for the engine, but the surging was still there. I cleaned the throttlebody and Idle Air Control motor and it got even better. I even went so far as to completelly clean the EGR system, which again helped, but like I said before, I have confirmed that my O2'* are very slow to respond with my autotap. Your problem with mileage could be anything from bad gas to O2 sensors that are on their way out. I always recommend when it'* time for a full tune up on most vehicles to replace O2 sensors when you do the rest. A bad O2 sensor could foul new plugs over a shorter period of time as well. You should get it checked out because you are just wasting money on gas right now! Figure around $200 for a full tuneup (probably would be less - and only get AC Delco O2 Sensors which are cheaper from GMPartsDirect.com). If after the tuneup you get 22mpg, that'* 7mpg better. You'll pay off that $200 in less than 500 miles (with a premium fuel price of $3/gal - it'* higher here now).

Good luck!
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Old 09-01-2005, 10:31 PM   #8
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My Bonneville is stock and I get about 18-20 MPG in town, which is red light after red light. I took a trip to Virginia back in May and got 27 MPG going about 65-85 MPH on average. It was about a 900 mile trip each way and on the way home I only filled up once in Savannah, GA. I've been really pleased with the gas mileage considering the size of the car.
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Old 09-01-2005, 10:51 PM   #9
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In warmer weather, I have been consistently averaging above 26mpg. Last week, I filled up in the morning and after the 44 mile commute, the DIC showed 30.1. As I try(unsuccessfully for the most part) to explain to my wife, the more you use your brakes, the lower the fuel economy. Anticipating when you need to slow down or stop and getting out of the gas early does pay off in better fuel economy not to mention less wear and tear on the brakes.
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Old 09-01-2005, 11:25 PM   #10
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I'm getting maybe 20-21 mpg around town, maybe 26-27 mpg all highway.
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