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856 messages, Last post on Nov 22, 2009 at 8:38 AM
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Finally cooled off enough for me to turn off the A/C (normally run on ECO). Several posters on the "other" forum state that A/C, even on ECO mode costs them 3 to 5 mpg. On my recent 125 mile trip where I have documented the trip mpg several times I was within the normal expectation for the trip with the A/C off and the temp at about 70. The same for the trip back and the temp had dropped to the mid 50's. Both trip mpg's were very close to my normal average for those same trips. (I really didn't expect to see 45+mpg on the trip from turning off my AC) I guess I'm curious if others really see a significant decrease in mpg from using their AC. My next experiment will be when it does drop to the 30's as it has also been suggested that I should expect a 10 to 15% drop this winter (another 3 to 5 mpg?).
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Replying to: wvgasguy (Oct 22, 2006 12:17 pm) g
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Replying to: grg (Oct 22, 2006 5:16 pm) If there is that much of an impact to them I would conclude it's because they run on mild battery boost more often and thus the ICE has to run to keep the battery charged for the AC. In the case of my hilly drives (and I still get 39.63 mpg overall)perhaps because my ICE is constantly on and off for up and down hills it keeps the battery charged incidentally with no incremental impact to overall FE? I say this because a lot of times while monitoring the NAV Energy screens I see the ICE charging the battery while there is excess hp being generated. I may be in a mode somewhere between FE of 40 to 60 but my battery is being charged while the ICE is still propelling the TCH. I will be curious to see how steady 30 degree temps affect the TCH milage from someone that gets good FE (like you). Keep me updated please. The same folks have suggested that all cars see a drop of 10 to 15% in the winter. On previous cars at 16 mpg I probably didn't notice it. However at 39+ I will notice a 10% drop easily. I'm still wondering though since a lot of my high FE is due to the battery will we see as much of a drop as a ICE only vehicle. The next few months will tell the story. |
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Does anyone know whether the A/C is OFF or ON when the ECO is ON (display shows ECO) and the A/C is OFF? Is it better to have the ECO mode OFF or ON for FE when the A/C is OFF??
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Replying to: agnosto (Oct 23, 2006 4:09 am) I too await the answer from someone more knowledgable. |
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I no longer can post on the "other" hybrid forum but I know many of them check these postings so I'll answer their question as well as post info for regulars here on edmunds. They were concerned that the FE calculated manually is as much as 2mpg different from the computer reading. I've had the same experience. If you don't fill up to the exact same spot in the tank (really hard to ensure) you may be off from tank to tank by several tenths of a gallon. Also if you are filling a "short" tank, that is maybe only after 300 miles rather than 600 miles the error will be even further exagerated. Example: with 300 miles the difference in 36 mpg and 38 mpg is 0.4gallons. Typically you won't be off that much but the error from the last fill up can exagerate the current tank as well. My manual averages vary from 2 to 3 mpg low to 1 mpg high as compared to the computer. However, over time and 14,500 miles I have found that the computer is within 1 mpg of my manual calculation. Now here's the rub. I expect my manual calculation to be accurate. However several GPS owners and my self (bought a new GPS) have verified that the odometer reads 1.5% low. When I "correct" the manual calculations over the life of my TCH I have made up over half of the discripancy. For me, my lifetime averages are: 38.6 manual calculation 39.6 computer reading 39.2 "corrected" for odometer error There is still a difference, but I have found that the computer reading is closer than the manual. Bummer for a die-hard number freak like myself. I have not heard a good explaination about the rest of the error, but I know that in the natural gas business it's difficult to get an accurate measurement on a meter for low flows and high flows from the same meter. It's possible that the measurement of fuel usage (number of squirts from the FI nozzel)in the TCH has error in it and possibly in low fuel usage situation (pulse and glide) the computer may give inaccurate readings. Anyway, for what's it's worth, that's my 2cents on computer vrs manual calculations. By the Way, the speedometer also has about a 3mph error at 70mph. It does not effect anything but the speed reading as the odometer error appears to be tied to the computer. Also, the error in the speedo is in the opposite direction of the odometer error. Any correction in speedo (taller tires) makes the odometer error even further off.
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Replying to: wvgasguy (Oct 26, 2006 7:33 am) |
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Replying to: wvgasguy (Oct 26, 2006 7:33 am) ditto
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Replying to: jbollt (Oct 29, 2006 6:40 pm)
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