camary gas mileage strangeness

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Old 19 Jul 2006, 12:45 pm   #1 (permalink)
cpliu
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Default camary gas mileage strangeness

I kept a detailed record of the gas usage and mileage on my Camry when
I drove longer miles before. At these days, I drove slowly at 57-60 MPH
and I got an average of 37.61MPG for a period of 1 year and 2 months.
It was roughly 25% road and 75% highway driving. Then I didn't record
the mileage for about 2 years. I started recording the mileage the last
half year since I travel between 2 cities frequently. My MPG has
dropped to 32MPG in average with roughly the same 22% and 78% highway.
I also noticed that the way to get a higher gas mileage has changed.
The ideal speed used to be between 55-60MPH, but now it needs to be a
little over 70MPH.

Compare the MPG at different speeds (from a trip of ~160 miles):
62.5MPH - 29.49 to 30.11 MPG
70 MPH- 32.95 to 33.46 MPG
72 to 73 MPH- 33.19 to 35.56 MPG

So basically, the faster I go the less gas I use as opposed to the old
days I got more driving at 57.5MPH. I never tried faster but I think
MPG would drop if I go faster. The only thing I can think of is that I
changed the spark plug which is Bosch 2 ground electrodes before I
started recording my mileages this time instead of the 1-electrode ones
that I used before.

So do you think that different spark plugs generate different gas
mileages and it has different optimal performance at different speeds?
I've not changed my gas filter to tell if that makes any difference.

My car is 1994 4 cyl. Camry with ~108,000 miles on it. It had 60K to
70K miles on it when I recorded the 37.61MPG.

Any suggestions on getting more MPG out of it. It still runs well, and
I hope to get another 100K out of it.

Thanks,

cpliu

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Old 19 Jul 2006, 06:04 pm   #2 (permalink)
jg
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Default Re: camary gas mileage strangeness


"cpliu" <spamfreeliu@yahoo.com> wrote in message
news:1153331130.166715.28880@i3g2000cwc.googlegrou ps.com...
>I kept a detailed record of the gas usage and mileage on my Camry when
> I drove longer miles before. At these days, I drove slowly at 57-60 MPH
> and I got an average of 37.61MPG for a period of 1 year and 2 months.
> It was roughly 25% road and 75% highway driving. Then I didn't record
> the mileage for about 2 years. I started recording the mileage the last
> half year since I travel between 2 cities frequently. My MPG has
> dropped to 32MPG in average with roughly the same 22% and 78% highway.
> I also noticed that the way to get a higher gas mileage has changed.
> The ideal speed used to be between 55-60MPH, but now it needs to be a
> little over 70MPH.
>

Could be down to the age of the car. I've had enough trouble with Bosch
plugs to replace them with anything else when I suspect a problem. Maybe the
fuel has changed subtley.


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Old 19 Jul 2006, 07:45 pm   #3 (permalink)
m Ransley
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Default Re: camary gas mileage strangeness

The faster you go the less mpg you get....... Max mpg is apx 40 mph,
just when the over drive shifts. As to getting less mpg a year later,
well sure, parts wear, a stretched timing belt cost me 4 mpg, till I
reset timing. Plugs, wires, cap, rotor, coil, all increase resistance
with time, your O2 sensor, engine compression , and many more things
need regular maintenance. Also different season gas formlas play a big
part. But you dont get more Mpg going faster, it was something else
afecting it, maybe the Gas. In the midwest winter formulas lower mpg by
apx 2 mpg, and formulas have changes over the years many times.

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Old 20 Jul 2006, 02:10 pm   #4 (permalink)
cpliu
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Default Re: camary gas mileage strangeness

m Ransley wrote:
> The faster you go the less mpg you get....... Max mpg is apx 40 mph,
> just when the over drive shifts. As to getting less mpg a year later, ....


It's puzzleing to me too but the fact is I did get higher MPG when
driving faster. It's the same car, same gas from the same gas station
(BP or Shell). Everything else is equal except I drove faster in later
trips.

1) Trips happened in the past winter. Temperature was not too much
different.
2) The travel was about 300 miles when I filled up the gas tank. I did
it for a period of time. So there wasn't too much margin of error.

I found similar result with a Honda Civic I owned. It didn't get as
much MPG at 55 than 70. This is the first time, I got different results
at different time on the same car. Before, I got 32MPG driving at
70MPH; > 35MPG at 57MPG. Now, the same car got more when driving at
70MPH. If I get more gas mileage at 57MPG now, I would believe it's the
aging of the car.

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Old 20 Jul 2006, 05:25 pm   #5 (permalink)
m Ransley
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Default Re: camary gas mileage strangeness

Who figures the milage, a computer or you, I would not trust the car
computer, and this assumes you fill it the same way, and realy at the
same pump, because how do you know you dont overfill it a bit. Either
way what you state does not work, Energy needed is not proportional to
speed, there are formulas, but the fact is on a given mile the faster
you go art a point it just takes more gas. Or anopther way to look at it
it may take 15hp to go 50 mph, but 75hp to go 100mph. The faster a motor
runs the less efficient it is.

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Old 20 Jul 2006, 06:18 pm   #6 (permalink)
Dave Dave
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Default Re: camry gas mileage strangeness

overdrive kicks in at 48 mph on my 06 camry 4 cyl. at 50mph rpm is
1800. my 97 corolla also kicks in final gear at 48 mph but don't know
the rpm since the 3 speed auto doesn't have a tach.

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Old 20 Jul 2006, 11:47 pm   #7 (permalink)
sqdancerLynn
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Default Re: camary gas mileage strangeness

Could be a difference in Tire type or even tire pressure

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Old 30 Jul 2006, 07:15 pm   #8 (permalink)
toyotadaddy
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Default Re: camary gas mileage strangeness

It could also be the different amount of ethenol in the fuel.
Ethenol is a lower BTU fuel and can cost you about 4 mpg.
On the issue of faster gets you better fuel economy.
I had a 1981 Volkswagon Rabbit. If I drove it 55 I got about 35 MPG.
If I drove it 80 I got 48 MPG.
I'm not sure why???? I just know what the numbers worked out to time
and time again.
sqdancerLynn wrote:
> Could be a difference in Tire type or even tire pressure


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