sudden loss of gas mileage...WTF? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 11-28-2006, 02:49 PM
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sudden loss of gas mileage...WTF?

Before i picked up my Wester's Tune, i was getting 250 miles per tank on 87 octane...since the tune, i've been getting 270ish with 89 octane...

all of a sudden, i'm getting less, 240ish now with 89...WTF???

driving style hasnt changed...the only variable i see being an issue is the temp outside and/or the fact that its been 5k miles since my last oil change...

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  #2  
Old 11-28-2006, 02:52 PM
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All the oil companies are now starting to put out the winter blend of gas. This will cause your mileage to drop and remember that on cold days you will usually allow your car to warm up longer than normal and this to will cause a drop in mileage.
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Old 11-28-2006, 02:55 PM
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gordonho80 - Octane will not usually affect you MPG...

Different brands may a little bit but should be very similar.

Winter gas burns less effectively than summer gas.

Get some Techron in your system as clogged injectors kill gas mileage...
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Old 11-28-2006, 03:40 PM
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yeah but such a big difference? wow...i'll get some techron to clean out the injectors...i just cleaned the K&N cone...also need to do that oil change...
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Old 11-28-2006, 03:46 PM
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going from ~270 to ~240 miles per tank is probably attributed to the ambient temp swings. Ethanol blended / winter gasoline can do it or maybe a pressure drop in your tires.

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Old 11-28-2006, 04:18 PM
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What exactly is "per tank"? 17 gallons? 18 gallons? Running it dry each time? I doubt it. The only accurate way is to track the actual miles driven between fillups divided by the number of gallons you put in the tank. You can't go by a couple of tankfulls either. My average over 3000 miles before the Wester's tune was 16.18 mpg. My average for more than 10,000 after the tune is 16.82 mpg, or around 311 miles on an 18.5 gallon tank. Maybe I'm seeing a half a mile a gallon improvement with the tune.
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Old 11-28-2006, 04:43 PM
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Make sure you inflate your tires. When it get's cold, your tires drop a few PSI
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Old 11-28-2006, 04:48 PM
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now that you all mention it...my tires do look a tad low...

i'll have new tires in 2 days and i work from home the rest of the week so the TB will be sitting in the driveway for a few days...will be sure to properly inflate new tires...
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Old 11-28-2006, 05:32 PM
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yup I just checked my tires sunday morning after sitting all night.
26 psi is what I found all around. I bumped it up to 31. Doorjamb specs 32But I also noticed a slight decrease in gas mileage with winter fuel.
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Old 11-28-2006, 05:51 PM
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yep, along with winter blends come cooler temperatures for those tires to sit at.

I have tire pressure monitors in mine. The other day I came out to it and the right side was 33 and the left side was 29. Reason? The sun was shining on the right side I guess. I drove a couple miles and both sides leveled out.
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