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174 messages, Last post on May 13, 2009 at 4:45 PM
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Replying to: hamuller (Aug 11, 2008 6:57 am) Tires: You changed to tires with a higher rolling resistance, or don't inflate them to as high as pressure as before. But you may want tires that can handle rough roads and will have to compromise on rolling resistance. Are you still using the OE tire size? Oil: You are using an oil with a higher viscosity than needed. With modern oils, changing oil at 3 kmi is an unnecessarily short interval, unless you are frequently in very dusty conditions. Use synthetic of the right viscosity (check the manual) and change at 7.5 kmi at the shortest. Fuel: Ethanol in gasoline up to 10% could cause a 3% lower mpg which is 0.8 mpg less starting at 28 mpg.
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Replying to: jim314 (Aug 11, 2008 7:53 am) I don't drive in dusty conditions usually so I think I will extend my oil changes a little and try the synthetic oils next time. I never thought about ethanol but most of the gas I use does have 10% ethanol. That probably has something to do with it. I also change the air filter every 10K as recommended. Thanks again for the suggestions. Hank
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Replying to: hamuller (Aug 11, 2008 8:38 am) Even tires that are the same size can reduce your mpg. Especially if they're are more performance oriented. I wil try dropping the pressure by a few pounds and see if that helps That will make your mpg worse! Increasing the air pressure in your tires will improve your mpg. However, if you increase it too much, you'll compromise the vehicle's handling. On my aftermarket tires, I keep the pressure about halfway between what the manufacturer recommends for the OE tires and the max psi listed on the sidewall. -Frank
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Replying to: p0926 (Aug 11, 2008 3:29 pm) |
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Replying to: p0926 (Aug 09, 2008 9:09 am) The thing is, I get 17 - 18 mpg highway with the Avalanche no matter how loaded down it is. And I figure, if I added dual exhaust, a cold air intake and an E-Con programmer, I could probably improve that by a couple mpg and improve performance. So, from what I'm reading here, I'll pay quite a fuel mileage penalty stepping down from the Beetle TDI and won't gain that much by parking the Avalanche. I was just hoping I could routinely return 25 mpg+. Thanks for the input. |
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Replying to: phil53 (Aug 12, 2008 4:18 pm) As I've said before, this still beats the city mileage I get out of the F150, or what I got out of the cursed Dodge Intrepid  (whose untimely demise led directly to my purchasing the Forester  a month ago).
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Replying to: buckhuntr (Aug 12, 2008 5:51 pm) |
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Replying to: phil53 (Aug 12, 2008 4:18 pm) My city driving is not heavy here in Fairbanks, Alaska, but last summer in my '07 Outback (manual tranny), I averaged 26-27 around town. This last winter in my 08 Outback (auto), I got right at 20 through the coldest months of the year (-10 to -45 F); my old '96 Outback would drop to as low as 15-16 during that period, and my minivan even hit 13.5 on one tank last winter. I think your driving conditions would be harsh, indeed, if you averaged less than 20. Good luck. |
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So we took a long drive last night, and measured our MPG for the trip in each direction. My wife drove up, and got 30.0mpg. She hit 33 mpg for a short while, but the full trip was 30. Then I drove back, the same route but with less traffic, so my speeds were higher. I got 27.0mpg. She won, but I was impressed with the highway fuel efficiency.
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Replying to: buckhuntr (Aug 12, 2008 5:51 pm) |
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