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Sedans Saturn Aura Saturn Aura Real World MPG
65 messages, Last post on Jun 10, 2009 at 9:27 AM
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Replying to: phaetondriver (Nov 13, 2007 9:21 am) The formula is keep tire pressure close to 40 PSI, the tires are rated MAX 44 PSI so this is quite safe. Add an engine oil additive like Dura Lub, Slik 50, or any other additive with PTFE. Wow, 30 MPG! I am getting 27 mpg in my XR going 25 miles one way to work and back. Do you really think that the additives are making the difference or the tire pressure? Also, why do you suppose the manufacturer recommends 30 psi and no additives? Thanks.
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Replying to: steelerman (Nov 13, 2007 12:27 pm) Wow, 30 MPG! I am getting 27 mpg in my XR going 25 miles one way to work and back. Do you really think that the additives are making the difference or the tire pressure? Also, why do you suppose the manufacturer recommends 30 psi and no additives? My on-board computer said I got 27.8MPG for the trip, so you can't believe it, monitor the gas and miles and do the math for accurate MPG. I drove for MPG so I was easy on the go peddle, resisted the urges to pass everyone, and used the cruise control as mush as possible. When going uphill I used the manual mode and dropped to 5th and slowed my speed to mid to low 70's. I have used these PTFE additives for a long long time (about 1980) and every time it has proven to me to give more H-P, better MPG and longer engine life. The only car I ran Mobile 1 in was a turbocharged sport coupe and that was because of the hi-temp oil cokeing problems turbo's have. The Tires say max PSI is 44 so for best traction and mileage/wear you want to run them at about 85-90% cold of that Maximum. Several things happen when you do this. 1. The tires run cooler so tire pressure stays closer to the cold setting. Blowouts occurs most often to under inflated tires because the hi temp form scrubbing more tread on the pavement causes the air inside to expand much more. 2. The tires stay flatter on the ground when cornering and provide a more secure ride on those fast mountain roads. I used to race auto-cross and I found that running 50 PSI gave me the best traction in the corners. The runs were too short to cause tire failures at these hi pressures, but a long trip could cause tire failure. 3. The ride gets hard, not as comfortable, when pressures are higher than the car manufacturer recommends. In the case of the Aura, I think one of two reasons for the 30 PSI recommendation is a nice soft ride and the second is the pressure is actually the recommendation for the 16 inch 65 series tires. When you go to a lower profile you need to increase the pressure or risk damaging the rims and tires when you hit those nasty bumps and cracks on the interstate. I am extremely happy with the ride and handling I get with my tires at 38-40 PSI. And there doesn't seem to be any wear on them at all with over 14000 miles. Hope this helps
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Replying to: phaetondriver (Nov 13, 2007 1:58 pm) One more question: Do you get a Tire Pressure Monitor warning when your tire pressure is that high?
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Replying to: steelerman (Nov 14, 2007 7:03 am) Do you get a Tire Pressure Monitor warning when your tire pressure is that high? No. The tire monitor doesn't warn of high pressure, just low, Mine has done this twice, both time the tire was about 25 psi due to a nail. I do get a report email telling me my tires are not inflated to the recommended 30 psi. I am not concerned about any excessive tire wear or unusual handling because of tires being inflated to 38-40 psi, especially for freeway driving. Just the opposite is true. Check it out for one tank of gas on your daily commute. Can't hurt to verify what I am saying. |
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Over the last 3 weeks I have driven 1150 miles. Last three tank fulls came to 40.2 gal. My trip computer said I got 26.7 MPG My calculations show it was more like 28.6MPG  There was about 850 miles of freeway driving (50 - 80 MPH), the rest was city driving, short trips of 2-5 miles at 0- 40 MPH. I am totally stoked at this mileage in a 250 HP sedan.  If one of those 4 bangers that gets 34 highway MPG could get 30 MPG combined would have saved about 2.5 gallons on the same 1150 miles, or $8. The savings of $7 per 1000 miles? That's $350 for 50K miles saved by the 4 bangers. Big deal 
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Last trip of over 1200 miles mixed 800 highway and 400 city I averaged 26.8 in my 2007 Aura XR. Best leg was 29.9mpg (one 4400 foot hill with a 7-10% climb at 75mph). Not I-4 mpg but very good for a 3.6/252hp V6 I think. Anyone interested in some really good mileage? check pout this new car from BMW. I took this pix at a Palm Springs parking lot, notice the plate is from Canada   See more Car Pictures at CarSpace.com"> |
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I am on my third oil change which I got a few months ago at just under 9000 miles. I now have over 17000 miles and the DIC says I have 40% of my oil life remaining. At this rate I will be over 12000 miles on this oil change. The only thing I have done to the oil was replace one quart of oil with one quart of Slick 50. Anyone else experiencing this kind of oil life according to the DIC in their Aura? Anyone using Mobile 1 and if so are they getting unusually long oil life according to the DIC oil life meter? |
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Replying to: phaetondriver (Feb 13, 2008 7:16 pm)
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Replying to: mickeyrom (Feb 13, 2008 7:36 pm) To maintain the warranty I need to change the oil when the DIC indicates I am within 10% of the oil life. I have just been reading of other GM owners that are getting very high mileage between oil changes according to the on board oil life computer.
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Replying to: phaetondriver (Feb 13, 2008 8:01 pm) |
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