What is the "optimum driving style" for mpg?

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Subject Author Date
What is the "optimum driving style" for mpg? Lon 04-22-2008
Posted by Tomes on April 24, 2008, 8:42 pm
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"Mr. G" ...
> Elmo P. Shagnasty ...
>> Lon wrote:
>> <snip!>
>> > I envy those who consistently report 10-20% better
>> > mileage than I have attained, and suspect that the
>> > deficiency is in my driving.
>>
>> You are driving your car like a normal car, like everyone else on the
>> road drives, and that's fine. You're getting good mileage.
>>
>> If you want to get what those other people are reporting, you can (a)
>> lie (like most of them), or (b) start driving very, very weirdly and in
>> the way in traffic.
>>
>> Do you want to be the dweeb who's screwing around in traffic, playing
>> his dashboard video game?
>
> I am doing neither a) nor b), and average well over 50 MPG. (actual fuel
> use vs. miles driven, not based on the MFD.) I'm sure a big part of
> that is my commute is 36 miles each way. As mentioned before, one of
> the MPG killers are short trips, since MPG is poor in the first 5
> minutes or so of driving. So on a short trip that will be a significant
> factor in the overall mileage, whereas on a longer (45 min-1 hr) trip,
> it's largely offset. My tires are at 40/38 psi, which I check
> regularly. I block my grill to varying degrees depending upon the
> weather, and I use an engine block heater year-round, which is a big
> help with the initial mileage.
>
> I don't drive in a way that impedes traffic. In fact, I've noticed that
> if I get behind a particularly slow driver, my MPG actually suffers a
> bit (based on the MFD history.) I accelerate smoothly, try to keep a
> steady speed, and begin to slow down as soon I see I'm going to need to
> stop ahead. I DON'T do the pulse & glide (which is I think what was
> being referred to here as 'PriusFoot'. In fact, I engage the cruise
> control as much as possible. I do try to maintain stealth or warp-
> stealth on long downgrades, but never slowing to the point where I'm
> below the speed limit if someone is behind me. In fact, it usually
> isn't necessary to slow down... just a light touch on the throttle.
>
> The only drivers I seem to piss-off are 1) ones that apparently think
> everyone should be doing 10+ over the speed limit, and 2) the idiots who
> think you need to race up to the stopped traffic as quickly as possible
> so that you can jam on the brakes. Then again, I've encountered such
> drivers long before I started driving a Prius.
>
> The fact is, I've always had sports cars or sporty sedans, and my
> driving style was to go as fast as I thought I could without getting a
> ticket (radar detector was required equipment.) Now that I stick to the
> speed limit, I find I'm much more relaxed, and even long trips don't
> take significantly more time.
>
> You can choose to assume I'm exaggerating the mileage I'm getting. I'm
> just hoping that I can help others improve their MPG, since it *is*
> possible to regularly get over 50 MPG without resorting to stunt
> driving.

I think that this is all very well said and reflects my perspective.
Tomes

Posted by Bob & Holly Wilson on April 24, 2008, 5:14 am
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> My '04, purchased in late '03, has about 52k miles on it
> and has averaged about 43mpg since new - less in winter,
> more in summer. I'm in S Calif, so "winter" is a period
> on the calendar rather than a season. 90% of the time
> there's just me aboard, so I benefit from the HOV
> sticker! The tires are inflated properly (+2psi) and the
> wheels are aligned.

It would help to see a printout from the last alignment check. The rear
wheels are 'fixed' but can be adjusted for less toe and camber to reduce
rolling resistance. How many miles are you getting from the tires?

Also, I run my Sumitomo tires at the maximum sidewall pressure, 51 psi
but my route is on good streets at urban speeds. The oil level is about
1/2 to 3/4 between the fill and full marks.

> I envy those who consistently report 10-20% better
> mileage than I have attained, and suspect that the
> deficiency is in my driving.

Not necessarily so.

> My "technique" is to stay off the brakes, doing a lot of
> coasting and careening around corners, on the theory
> that neither regen nor friction braking are as good as
> using kinetic energy to continue moving. That means I
> must take my foot off the gas as soon as it becomes
> evident that the car will have to stop.
>
> What else can I do to improve mileage?

We don't have enough information. If you can provide two Google Map
'addresses' that show your normal commuting route, we might be able to
suggest some things to test. Route planning pays big dividends _IF_
there are fuel efficient alternatives you can use.

Bob Wilson

Posted by Lon on April 24, 2008, 7:14 pm
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Bob & Holly Wilson wrote:
>
>> My '04, purchased in late '03, has about 52k miles on it
>> and has averaged about 43mpg since new - less in winter,
>> more in summer. I'm in S Calif, so "winter" is a period
>> on the calendar rather than a season. 90% of the time
>> there's just me aboard, so I benefit from the HOV
>> sticker! The tires are inflated properly (+2psi) and the
>> wheels are aligned.
>
> It would help to see a printout from the last alignment check. The rear
> wheels are 'fixed' but can be adjusted for less toe and camber to reduce
> rolling resistance. How many miles are you getting from the tires?
>
> Also, I run my Sumitomo tires at the maximum sidewall pressure, 51 psi
> but my route is on good streets at urban speeds. The oil level is about
> 1/2 to 3/4 between the fill and full marks.
>
>> I envy those who consistently report 10-20% better
>> mileage than I have attained, and suspect that the
>> deficiency is in my driving.
>
> Not necessarily so.
>
>> My "technique" is to stay off the brakes, doing a lot of
>> coasting and careening around corners, on the theory
>> that neither regen nor friction braking are as good as
>> using kinetic energy to continue moving. That means I
>> must take my foot off the gas as soon as it becomes
>> evident that the car will have to stop.
>>
>> What else can I do to improve mileage?
>
> We don't have enough information. If you can provide two Google Map
> 'addresses' that show your normal commuting route, we might be able to
> suggest some things to test. Route planning pays big dividends _IF_
> there are fuel efficient alternatives you can use.
>
> Bob Wilson

Just imagine two locations six miles apart, level
ground, with four lights. Light traffic in the morning
(I arrive later than most), heavy in the evening. I
coast up to red or reddening lights, and barely touch
the brakes.

As for the alignment printout - I have no clue nor any
inclination to do it again. Seems to me that 51PSI is a
huge number! I wonder what the difference in MPG would
be using the rolling resistance at that PSI vs
prescribed, on Brown's computer.

Someone commented regarding my "careening around
corners." 50 years ago I raced for a living, and loved
it. Such driving might not save much gas, but it brings
back memories.

Thanks for the input.

Lon Ranger

Posted by Bob & Holly Wilson on April 24, 2008, 8:19 pm
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> Just imagine two locations six miles apart, level
> ground, with four lights. Light traffic in the morning
> (I arrive later than most), heavy in the evening. I
> coast up to red or reddening lights, and barely touch
> the brakes.

Something like this:
http://hiwaay.net/~bzwilson/prius/map.jpg

>
> As for the alignment printout - I have no clue nor any
> inclination to do it again.

As you wish.

> . . . Seems to me that 51PSI is a
> huge number! I wonder what the difference in MPG would
> be using the rolling resistance at that PSI vs
> prescribed, on Brown's computer.

http://hiwaay.net/~bzwilson/prius/pri_tire_010.jpg

But whatever works,

GOOD LUCK!
Bob Wilson

Posted by e on April 24, 2008, 9:30 pm
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Bob & Holly Wilson wrote:
>
>> . . . Seems to me that 51PSI is a
>> huge number! I wonder what the difference in MPG would
>> be using the rolling resistance at that PSI vs
>> prescribed, on Brown's computer.
>
> http://hiwaay.net/~bzwilson/prius/pri_tire_010.jpg


That's impressive. I might pump 'em up until I feel a
significant difference.
Thanks!

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