Average MPG? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-04-2003, 04:34 PM   #11
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hmm... you sure that'* not "Read my licence plate AT 101"???
Ya I'm sure They can't read it after 85. By 101 I'm too far ahead.
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Old 09-04-2003, 08:06 PM   #12
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Anywhere from 22-25 is what I get, mostly in town driving. On the way to and from Toronto I was hitting 35mpg.
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Old 09-04-2003, 11:34 PM   #13
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I average around 26 MPG with mixed, back road driving at around 55-65 MPH average speed...
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Old 09-04-2003, 11:55 PM   #14
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We have never reset the DIC in our 2000 SSEi, it is driven probably 75% highway miles, 25% city, and the DIC reads 20.6 mpg after 83,000 miles. For the longest time it was at about 19.6-19.8, but since we put the rockers in at about 70k the mileage has just been going up and up!
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Old 09-05-2003, 02:27 AM   #15
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My 01 ssei says 18.2 with 50/50 of highway to city. So rockers increase gas millage, what about cams? Haven't deciced which route I want to go yet.
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Old 09-05-2003, 11:01 AM   #16
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My 98 SSEI get'* about 28, with a 3.4 pulley and rockers., but I usually dont get that good, I like the blower noise too much.
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Old 09-05-2003, 11:52 PM   #17
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i get about 21-26 on the hwy and 16-18 in the city gas mileage also matter on the altitude you live in high air is less dense?
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Old 09-06-2003, 02:17 AM   #18
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i get 27/30 no mods.
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Old 09-06-2003, 10:04 PM   #19
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Glasuan, I have the exact same car as you (check my sig), except I have alot more miles. I get 27-28 MPG pretty consistently, speed runs dont even seem to move it too much. You might want to make sure you have a clean air filter & check PCV valve/O2 sensor, etc. About 90% of my miles are on the highway.
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Old 09-06-2003, 10:57 PM   #20
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So rockers increase gas millage, what about cams? Haven't deciced which route I want to go yet.
This is what usually suprises people about mods until they think about it. If you put an air intake on your car and drive the car exactly as you did before it is going to get better gas mileage than before the air intake because the engine can breathe easier, making more power and making the engine work less and be more efficient. If you put a more free flowing exhaust on your car the gas mileage is going to up in the same driving conditions because again the engine can breathe easier and make more power with less work. So, a cam and rockers are going to do the same thing. Since the engine will be able to breathe much easier and make more power doing the same amount or less work than before meaning it will get better gas mileage. So basically almost every mod you do to your car will increase your gas mileage except for a smaller pulley and things like that. This would be exactly why the GTP gets 35+ mpg on the highway. There are more things that effect gas mileage but that is the easy way to explain it.
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