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Re: 08 sportcombi same issue - tires, gas
Posted by Mark in Marine (MN) (more from Mark in Marine (MN)) on Sat, 28 Feb 2015 07:13:07
In Reply to: 08 sportcombi same issue, whitesaab, Fri, 27 Feb 2015 10:11:45
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Don't have good enough data on our SAABs to comment fully (my daughters drive them mostly). The 2 vehicles that I've driven the past decade on a 65 mile minimum round trip to work every day have both been sensitive to tires - every Fall switching from Summer to Winter tires I increase gas mileage about 3-5% (1-2 mpg out of something near 30). I lose a like amount every Spring switching back. This is all same gas station, same car, same general drive and climate. It's a combination of width and sidewall hysteresis - tires were all well-aired, and I preserved diameters.
Gasoline sources also mean a lot - more ethanol will lower mileage per gallon significantly in a modern well-designed engine. So much so that one car magazine recently did a sidebar on how they sub-contract their fuel economy testing to a lab using gasoline that is calorimeter tested to have a constant energy content. The lab claimed to have observed 15 percent variability in energy content per gallon sampling gasoline in their region.
None of this 'solves' your problem, but if your car is running as designed, all of these things can still add up to a lot of variability.
Mark in Marine (MN)
posted by 50.33.38...
Posts in this Thread:
- 08 Aero gas mileage, Saabrocket, Wed, 25 Feb 2015 16:26:18
- Re: 08 Aero gas mileage, BillU, Sat, 28 Feb 2015 10:24:20
- Re: 08 Aero gas mileage, turbosaab
, Sat, 28 Feb 2015 04:33:15 - 08 sportcombi same issue, whitesaab, Fri, 27 Feb 2015 10:11:45
- Re: 08 sportcombi same issue - tires, gas, Mark in Marine (MN), Sat, 28 Feb 2015 07:13:07 <-- Viewing This Message
- Re: 08 sportcombi same issue, Snowmobile
, Fri, 27 Feb 2015 10:29:32 - Re: 08 sportcombi same issue, Slug
, Fri, 27 Feb 2015 10:21:22
- Re: 08 Aero gas mileage, Slug
, Fri, 27 Feb 2015 06:10:32 - Re: 08 Aero gas mileage, XLR99
, Thu, 26 Feb 2015 07:27:38 - Apples to oranges., dmz789qqq, Thu, 26 Feb 2015 06:50:06
- Yes, Boris Bubbanov, Thu, 26 Feb 2015 11:05:43
- May not be normal, MI-Roger
, Wed, 25 Feb 2015 16:46:23
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