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Old 01-18-2012, 01:23 PM   #1
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Fuel economy

Anyone experience a significant drop in mpg? I have an 06 convertible that used to get around 27 highway now I'm lucky to get 22. My city mileage went from 22 to 16. Any ideas?
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Old 01-18-2012, 01:40 PM   #2
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Tune up?.. Air filter, fuel filter, plugs?... Those three things right there can help kill your mpg's!...
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Old 01-18-2012, 01:53 PM   #3
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That's what I get 16.8 around town and about 24 on the highway, I have a 5spd with 3.55s btw
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Old 01-18-2012, 02:26 PM   #4
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The mobile 1 shop my company uses for all the service vans/trucks said this car does not need a tune up until 80k true?
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Old 01-18-2012, 02:28 PM   #5
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I have a 2010 with cams, intake, TB, full exhaust and CAI with 373's a d get 16-17 in city and 24-25 hwy

---------- Post added at 01:28 PM ---------- Previous post was at 01:27 PM ----------

Quote:
Originally Posted by Silversky545
The mobile 1 shop my company uses for all the service vans/trucks said this car does not need a tune up until 80k true?
Hmmm.... I would say more like 50-60k, but it all depends on what you have done to it and how you drive it too.
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Old 01-18-2012, 02:58 PM   #6
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I've got a k&n drop in, bbk TB, & exhaust but my drop has come a long time after all that stuff. Last mod was TB & that was 6 months ago. In fact it went up until I put on some new tires which were same stock size. I can't imagine same size tires making such a difference.
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Old 01-18-2012, 05:18 PM   #7
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Quote:
Originally Posted by Strick9
Anyone experience a significant drop in mpg? I have an 06 convertible that used to get around 27 highway now I'm lucky to get 22. My city mileage went from 22 to 16. Any ideas?
Tire pressure? When it gets cold tire pressure goes low.

My ford truck got down to 24 lbs, after I brought back up to 38, I picked 2.5 mpg
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Old 01-18-2012, 05:50 PM   #8
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Quote:
Originally Posted by GTRob504

Tire pressure? When it gets cold tire pressure goes low.

My ford truck got down to 24 lbs, after I brought back up to 38, I picked 2.5 mpg
+1
True story!
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Old 01-18-2012, 05:59 PM   #9
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Also in winter months some states run straight gasoline in the winter opposed to 10% ethanol like they do in the summer, maybe they are still running ethanol and that runs crappy in the winter
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