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  #1  
Old 10-14-2008, 01:29 PM
zookarama's Avatar
Recumbent Rider
 
Real Name: Rich
Location: Illinois
Hybrids: 2009 camry hybrid
Posts: 10
Default How accurate are the mpg meter displays?

Anyone done a comparison of the estimates of mpg that we get on our display, to a real 'empty tank - to- fill up' calculation? Being a skeptic, I'm wondering how optimistic the figures that are shown on our vaious dashboard displays are. I've only been driving my new TCH for a week now and the mpg average that I seem to be getting (38.2) is encouraging.
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  #2  
Old 10-14-2008, 02:05 PM
Ridiculously Active Enthusiast
 
Real Name: Larry
Location: New Jersey
Hybrids: non-NAV '08 "The Gray Lady"
Posts: 1,987
Default Re: How accurate are the mpg meter displays?

not very...at best they're ~1-1.5 MPG high

.

For answers to (almost) every question... **Toyota Camry Hybrid New Owner's F.A.Q. **
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  #3  
Old 10-14-2008, 03:16 PM
2009TCH w/NAV bought 4/08
 
Real Name: John
Posts: 121
Default Re: How accurate are the mpg meter displays?

I took a trip involving a few hundred miles after filling then filled up again. The listed mileage was within 0.1 mpg of dividing trip odometer by amount of gas added.
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  #4  
Old 10-14-2008, 04:42 PM
Active Enthusiast
 
Real Name: Dave
Location: Southern California
Hybrids: Blue Ribbon Metallic/Ash TCH
Posts: 215
Red face Re: How accurate are the mpg meter displays?

Quote:
Originally Posted by haroldo View Post
not very...at best they're ~1-1.5 MPG high
I disagree that it's not very accurate. 1-1.5 mpg high is very accurate. I've had other cars that weren't within 15%. 1.5/45 is 3%. When you consider temperature differences on fuel and other issues, that's pretty good. Also, I have found that the odometer is off the other way. When you put the numbers together, I calculate the mfd is within 1% of the true mpg.

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  #5  
Old 10-15-2008, 12:36 AM
Ridiculously Active Enthusiast
 
Real Name: Jimmy
Location: Southern New Mexico
Hybrids: 2012 XLE Hybrid
Posts: 1,307
Default Re: How accurate are the mpg meter displays?

I found the mfd readout on mpg is always 1 to 2 mpg higher than my calculated readings.

I even tried using a carpenter's level at this one gas bay to make sure it was level.
It helped but it was still reading 3/4 to 1 mpg high, although I use the mfd readout for a good mpg driving reference. I like the calculator to figure my true mpg.

I should mention, I fill my tank with the gas nozzle set to auto low. I allow it to auto shut off, then I put up the nozzle. No pumping in any extra gas. This way, I seem to get a more consistent mpg reading from tank to tank.

Last edited by rburt07; 10-16-2008 at 12:46 PM.
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  #6  
Old 10-15-2008, 05:47 PM
Enthusiast
 
Real Name: John
Location: Montgomery, NY
Hybrids: 2007 Toyota Camry Hybrid - non-NAV
Posts: 26
Default Re: How accurate are the mpg meter displays?

I find my MFD to be about 2.5% high.b

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  #7  
Old 10-16-2008, 06:52 AM
Active Enthusiast
 
Real Name: ANDY
Location: SAN DIEGO
Hybrids: TOYOTA CAMRY
Posts: 64
Thumbs up Re: How accurate are the mpg meter displays?

I find my display is 1-1.5mpg better than actual trip milage. The displayed odometer reading is 1.5% under mileage posts and/or my GPS and getting higher as the tires wear down at 14,000 miles. So, it's almost a wash.

.

Andy
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  #8  
Old 10-16-2008, 09:13 AM
test54's Avatar
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Real Name: Dan
Location: Asheville, NC
Hybrids: '08 Camry Hybrid
Posts: 209
Default Re: How accurate are the mpg meter displays?

I wish their was a better way to measure than going off the click at the pumps. Seems untrustworthy to me but I have no idea really.

When I do the math its usually a mile or two off mpg.

.

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  #9  
Old 10-16-2008, 05:45 PM
Pragmatist
 
Real Name: Steve Hansen
Location: South Florida
Hybrids: Lexus ES300h
Posts: 490
Default Re: How accurate are the mpg meter displays?

The fuel pumps at many gas stations are not accurate. In most states, they are supposed to be within one percent. But the state won't prosecute if it is even close. And then there is the question of thermal expansion of the fuel itself. Fuel pumps are capable of compensating for the thermal expansion. But, in most states, that compensation is not required, so it is not turned on. The net result is that the fuel measurement at a gas station is often off by 3 or 4 percent. You can guess which way.
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  #10  
Old 10-18-2008, 03:20 PM
Active Enthusiast
 
Real Name: Tom
Hybrids: 2009 Camry Hybrid
Posts: 188
Default Re: How accurate are the mpg meter displays?

One of the keys is to keep records consistently over time. You may calculate a little higher MPG on one tank (if you don't fill it quite as full) but the you'll pay a penalty on the next on where you actually put more in. It's a much better representation of the true MPG when you look at long term history and let the overages and underages wash each other out.

My historical mileage calculation (life of the car) compared with a compilation of the MFD readings (weighted for the miles run on each tank) shows the MFD displays about 2% high for me.

.



(It's actually an '09!)
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Old 10-18-2008, 03:20 PM
 
 
 
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