- #68 of 91
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Re: High revving engine [avj23]
by 150mphclub
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Jan 29, 2009 (4:58 pm)
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Replying to: avj23 (Jan 29, 2009 4:47 pm)
My 2009 Cadillac CTS revs between 2100 & 2200 at 70. I guess that explains the Infiniti reputation for bad fuel mileage.
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- #69 of 91
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Re: High revving engine [150mphclub]
by shmang
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Jan 29, 2009 (6:22 pm)
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Replying to: 150mphclub (Jan 29, 2009 4:58 pm)
Well, the high revs does not necessarily explain the bad gas mileage. Just as I said, my Honda revs higher and get 32 MPG on the highway (at 70MPH), which is a number the CTS can not reach. Not sure about the Scion or Cobalt though. But they are much lighter and has much less hp to begin with.
Infiniti could build a more efficient engine, but I think fuel economy is simply not their focus point.
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- #70 of 91
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Re: High revving engine [150mphclub]
by avj23
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Jan 29, 2009 (6:55 pm)
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Replying to: 150mphclub (Jan 29, 2009 4:58 pm)
Is yours AWD? What kind of MPG are you getting and what kind of driving.
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- #71 of 91
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Re: High revving engine [avj23]
by 150mphclub
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Jan 30, 2009 (4:09 pm)
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Replying to: avj23 (Jan 29, 2009 6:55 pm)
Automatic, RWD. 95% highway (usually about 75mph), 27 mpg.
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- #72 of 91
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Re: High revving engine [avj23]
by james27
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Jan 30, 2009 (6:27 pm)
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Replying to: avj23 (Jan 28, 2009 8:35 pm)
I have a 2006 M35x. Mostly highway, it's about 20-miles to work, and I typically get around 20mpg, the best I've done is about 26. If I spend a lot of time in the city (not very often), it does drop to the mid-teens. I do drive fast, but don't put my foot into it that often. Definately not in the slow lane.
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- #73 of 91
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Re: High revving engine [james27]
by shmang
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Jan 30, 2009 (7:09 pm)
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Replying to: james27 (Jan 30, 2009 6:27 pm)
Well, that sounds about right, except the 26MPG. I have never been able to get anywhere close to that - even when fuel economy is top priority. The best I got so far is 23.2 on highway 65mph, 70F, no A/C.
What did you do to get to around 26? I need to know in case the gas price goes to $4/gallon again 
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- #74 of 91
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Re: High revving engine [shmang]
by james27
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Jan 30, 2009 (9:52 pm)
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Replying to: shmang (Jan 30, 2009 7:09 pm)
200 miles on cruise control with gas that didn't have any ethanol in it, cool, but not super cold, level roads, no traffic. Per volume, alcohol doesn't have as much energy as gasoline and lowers your mileage. Hard to find depending on the locale and the season, but does make a difference. It helps if you run the tires at the high end of the recommended range as well.
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- #75 of 91
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Re: High revving engine [james27]
by palincal
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Feb 04, 2009 (8:49 pm)
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Replying to: james27 (Jan 30, 2009 9:52 pm)
2900 RPM at 70mph is normal for an M35. It is designed to rev high for sportiness. Check you trip computer for you av. speed. I get 19.5 MPG for an av. speed of 30mph. Keep you tires at 34-35 PSI. Use premium gas from a quality brand. Keep the windows up will driving above 40mph. If nothing works you have a problem. 10 MPG is too low even for a new car.
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- #76 of 91
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Re: High revving engine [palincal]
by AboutTreeFiddy
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Feb 15, 2009 (3:09 pm)
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Replying to: palincal (Feb 04, 2009 8:49 pm)
Note the 2009 M35 RWD with the new 7 speed trans has higher top gear. I'm seeing exactly 2000 rpm  60mph which would put it at about 2350 70mph (I'll check it 70 next time I'm out). My first half tank was 23 mpg (computer) with probably 70% highway, 25% suburban & 5% stop and go (easy driving during break-in).
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- #77 of 91
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Re: High revving engine [palincal]
by avj23
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Feb 16, 2009 (7:38 am)
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Replying to: palincal (Feb 04, 2009 8:49 pm)
Have just over 800 miles on the car now and still averaging at best 12 mpg almost all city/short trips. Took it in to the dealer and they said its fine, "it should improve slightly after break-in period." Wish I would've checked this site first might not have bought it. Nice car though.
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