Poor 07 SS/SC mileage
#1
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Thread Starter
Poor 07 SS/SC mileage
so i have noticed that on my 2007 SS/SC with GMS2 i am only getting on average around 19 city. now i drive pretty averagely and don't romp on it to often, once a week or so. i just dont understand what it could be, is this normal? i have changed the oil, air filter, spark plugs. could it be my high altitude (3,500ft) and cold weather?
#5
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#7
Senior Member
I say it's because of city driving. Im glade I live in the country and only drive country roads and highways. So I'm always adv. 29 but one time when I drove down town DC and sitting in traffic for an hour it went down to 24 mpg. So I could only imagine if you drive In the city everyday
#14
Senior Member
so i have noticed that on my 2007 SS/SC with GMS2 i am only getting on average around 19 city. now i drive pretty averagely and don't romp on it to often, once a week or so. i just dont understand what it could be, is this normal? i have changed the oil, air filter, spark plugs. could it be my high altitude (3,500ft) and cold weather?
#17
Senior Member
iTrader: (4)
#18
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iTrader: (1)
#19
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iTrader: (4)
I dont have a wideband to verify the AFR's yet so I dont play with the PE EQ ratio, only try to keep the o2mv around 865-875mv when tuning WOT until I have something that can actually tell me where im at exactly. With the longtube headers and no cat I presume the o2 sensor element runs a little cooler then stock so I use a reference of something similar to this. It's a ballpark measurement, that I just go by how the car feels. Stock WOT o2mv is somewhere around high 700s low 800s which correlates to the hottest o2 temp scale there.
#20
Senior Member
iTrader: (1)
It's not ideal by no means because there are so many variables to it, but ive done it on several car's over the past 10 years with great success. Before the advent of the wideband, narrowbands were the only thing available for determining the AFR. Ill probably be getting an LM2 over the next few months to share with two buddies of mine and then I can see what the actual o2mv are against the AFR the wideband reads.
#21
Junior Member
FWIW I just got 335km to 36L, which is 9.3km/L or 10.75L/km or 21.9MPG.
Only 100km was a nice highway cruising stint, everything else was urban stop and go type stuff.
Only 100km was a nice highway cruising stint, everything else was urban stop and go type stuff.
#23
Junior Member
Since changing my front wheel bearing which got to the point of being quite noisy and really rough when spinning by hand, my mileage has gone up noticeably. I will post up my results at the next fill up, but even with the colder weather, it seems to be around 10L/100km now.
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10-19-2015 12:35 AM