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Prius mpg strangeness

Old 11-29-08, 11:10 PM
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Prius mpg strangeness

I bought an '08 Prius in September and have been very happy with the car. For the first couple
of months I was able to get 52 mpg fairly easily with a combination of city and highway driving
without having to pay too much attention to how I was driving. Now for some strange reason I
can barely get 42 mpg. I don't think anything has changed with respect to my driving style. At
first I thought it might be that I've been using the heat more often since is colder out now, but
a 10 mpg seems excessive. So for the last week I've been driving it around without using the
heat at all and the performance hasn't changed.

Can anyone think of what sorts of things might cause such a drop?
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Old 11-29-08, 11:12 PM
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winter gas.
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Old 11-29-08, 11:14 PM
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Originally Posted by Grumpy McTrumpy View Post
winter gas.
"winter gas" ?

oh, so that's why it is so cheap ($1.59 to $1.93) lol.

ok, so seriously now...
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Old 11-29-08, 11:17 PM
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You have too many bodies in the trunk. More weight means more power to get moving. Time to dig a shallow mass grave!
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Old 11-29-08, 11:23 PM
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Originally Posted by x136 View Post
You have too many bodies in the trunk. More weight means more power to get moving. Time to dig a shallow mass grave!

I checked just now and found that the bodies mysteriously disappeared. So it must be something else. I'm kinda glad they are gone because they kind of smell.

Anyone out there on foo who isn't currently drunk??
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Old 11-29-08, 11:39 PM
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Originally Posted by Snicklefritz View Post
Anyone out there on foo who isn't currently drunk??
You must be new here.
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Old 11-29-08, 11:51 PM
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Originally Posted by Grumpy McTrumpy View Post
winter gas.
Yep, we recently went to a 10% ethanol gas and my mileage dropped substantially. Also, the car is generally less efficient in the colder months as more energy is needed to warm the car and keep it warm. Also the battery is less efficient when cold. All that adds up to a drop in mpg in the winter. My year round average is about 45 mpg. More in the summer and less in the winter.
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Old 11-29-08, 11:55 PM
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^^^ What he said.

PLUS:

Check your air pressure in your tires. Hot weather makes air expand, cold weather does the opposite. If the psi is not up to par, your gas mileage will be affected. Think about how it is to ride your bike on low tires.
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Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
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Old 11-29-08, 11:57 PM
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Originally Posted by Snicklefritz View Post
"winter gas" ? ok, so seriously now...
He is serious.

In Winter the temperature differential and the higher ambient humidity causes condensation on the inside of the underground storage tanks (and the tank in your car), putting a higher water content into the fuel. Cars don't run well on water.

You might try pouring a small bottle of rubbing alcohol into the next tank the next time you fill up.
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Old 11-30-08, 12:04 AM
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Originally Posted by Wordbiker View Post
He is serious.

In Winter the temperature differential and the higher ambient humidity causes condensation on the inside of the underground storage tanks (and the tank in your car), putting a higher water content into the fuel. Cars don't run well on water.

You might try pouring a small bottle of rubbing alcohol into the next tank the next time you fill up.
I thought he might have been joking only because the drop was quite large. I thought a 10 mpg drop meant something was wrong with the car. So this winter effect really can make that much difference?
(assuming the tires are fine)
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Old 11-30-08, 12:07 AM
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All of it adds up to the big drop.
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Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
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Old 11-30-08, 12:08 AM
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My I think it is cold weather related. If i were you i would post this same question at Gassavers.org they will help ya out alot more.
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Old 11-30-08, 12:18 AM
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Originally Posted by Siu Blue Wind View Post
^^^ What he said.

PLUS:

Check your air pressure in your tires. Hot weather makes air expand, cold weather does the opposite. If the psi is not up to par, your gas mileage will be affected. Think about how it is to ride your bike on low tires.
That is what I was thinking.
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Old 11-30-08, 12:19 AM
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Originally Posted by hockey4mnhs View Post
My I think it is cold weather related. If i were you i would post this same question at Gassavers.org they will help ya out alot more.
Oh yeah. The word of Foo is trash. Never mind us. We don't drive cars. Us bike people don't know squat about cars.
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Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
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Old 11-30-08, 12:33 AM
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Originally Posted by Siu Blue Wind View Post
Oh yeah. The word of Foo is trash. Never mind us. We don't drive cars. Us bike people don't know squat about cars.
seriously....
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Old 11-30-08, 12:45 AM
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sorry for my ignorance but what is foo I have seen this a few times already. Also I didnt mean it like that people at gassavers are just crazy when it comes to gettin the most out of mpgs
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Old 11-30-08, 12:48 AM
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"Foo" is the section of the forums you are posting in right now.

Referring someone to another site when she is getting answers here (from people who know cars) is kinda like telling someone at McDonald's to go to Jack-in-the-Box. Plus it makes us feel like you are doubting our word. She came here probably because she knows that we have some car fanatics as well as auto mechanics by trade here. Plus she knows us and might be comfortable asking here. But it's all good. You were only trying to help. No hard feelings.

And welcome to Foo.
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Originally Posted by making View Post
Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.

Last edited by Siu Blue Wind; 11-30-08 at 12:52 AM.
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Old 11-30-08, 01:50 AM
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^^^ hehe I decided to pay my membership fee here after getting awesome answers on Foo to all sorts of random stuff. I've even posted some of my mom's questions in here and got 1/2 page of answers in less than an hour. So now she always jokes that if she has a question about something, she will ask me to post something here. lol.
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Old 11-30-08, 02:06 AM
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Old 11-30-08, 02:16 AM
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...and nausea.
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Please dont outsmart the censor. That is a very expensive censor and every time one of you guys outsmart it it makes someone at the home office feel bad. We dont wanna do that. So dont cleverly disguise bad words.
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Old 11-30-08, 03:28 AM
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Originally Posted by Siu Blue Wind View Post
...and nausea.
So eat something.
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Old 11-30-08, 03:34 AM
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Not sure about california but here in oregon theres is ethenol in the gas year around
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Old 11-30-08, 05:24 AM
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Almost all gasoline sold in the U.S., that standard stuff we all know (87, 89, 92/3/4/5. etc.) has ethanol in it. Usually about 10%.
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Old 11-30-08, 06:29 AM
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My motorcycle doesn't even get 42 mpg you idiots.
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Old 11-30-08, 06:32 AM
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Originally Posted by Snicklefritz View Post
I bought an '08 Prius in September and have been very happy with the car. For the first couple
of months I was able to get 52 mpg fairly easily with a combination of city and highway driving
without having to pay too much attention to how I was driving. Now for some strange reason I
can barely get 42 mpg. I don't think anything has changed with respect to my driving style. At
first I thought it might be that I've been using the heat more often since is colder out now, but
a 10 mpg seems excessive. So for the last week I've been driving it around without using the
heat at all and the performance hasn't changed.

Can anyone think of what sorts of things might cause such a drop?
Put air in the tires. Max out the PSI for best mpg.
I get 43 mpg in my 2002 Echo.
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