Hybrid Gas Mileage Good? Bad? As Expected?

519 messages, Last post on Jan 16, 2007 at 6:14 AM

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What is this discussion about? Hybrid Cars, Fuel Efficiency (MPG)

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#493 of 519 Re: Driving habits [larsb] by falconone Dec 19, 2005 (2:30 pm)
Replying to: larsb (Dec 16, 2005 11:08 am) I agree about the stress level. I believe hypermiling techniques can be used in any car. Look at Xcel who achieves high 40's in his PZEV Accord. He doesn't seem to be late for appointments according to his posts!!! If I were to get a hybrid, I would definitely get a Prius. Judging from all the non hybrid folks chiming in, it looks like hybrid mania is just beginning!! I think the hybrids (especially the Prius) are really going to do quite well over the next decade.
#494 of 519 Update on gas mileage/fuel costs by larsb Dec 20, 2005 (9:13 am)
For those who might care: From August 8th 2005 through December 19th 2005, my Civic Hybrid has achieved this: 3,070 miles driven $134.66 spent on fuel 135 days total about $1 per day in fuel costs about 4.4 cents per mile in fuel costs about 49.3 miles per gallon average fuel price was $2.579 per gallon I could expect no better than this from anything this side of a Honda Insight. Hooray for Hybrids !! Replies to this message: falconone (Dec 20, 2005 9:29 am)
#495 of 519 Re: Update on gas mileage/fuel costs [larsb] by falconone Dec 20, 2005 (9:29 am)
Replying to: larsb (Dec 20, 2005 9:13 am) Actually...hooray you don't drive a diesel. At least you're being lean and green!!! Our planet thanks you!!!
#496 of 519 51.2 mpg by robert47 Dec 20, 2005 (11:28 am)
I just purchased a HCH w/o navi yesterday for my wife. i filled up the tank of BMW 528i for $37.91. She is really bad driver as far as mpg. She said she averaged 51.2 mpgh from the dealership to our house (36 miles away - 60% highway - 40% lights). I already know that it will take too many days to fill up this HCH and will cost only $25. Thanks for the hybrids. Replies to this message: larsb (Dec 20, 2005 11:37 am) falconone (Dec 20, 2005 12:29 pm)
#497 of 519 Re: 51.2 mpg [robert47] by larsb Dec 20, 2005 (11:37 am)
Replying to: robert47 (Dec 20, 2005 11:28 am) congrats Robert47, and enjoy your Hybrid !! Encourage all your friends and family to shop hybrids next time they are car shopping !! Welcome to the club.
#498 of 519 Re: 51.2 mpg [robert47] by falconone Dec 20, 2005 (12:29 pm)
Replying to: robert47 (Dec 20, 2005 11:28 am) Congrats !!! You made a wise choice!! Glad to hear you're getting such fine mileage.
#499 of 519 General MPG question by bobw3 Dec 21, 2005 (7:49 am)
Maybe someone here can help me with my question. If an engine is going a constant RPM, say 1500, then regardless if it's idling, up a hill, down a hill, or on flat ground, if the RPM is a constant 1500 then the gas used would be the same...correct? So if at 60mph on cruise it's at a constant 2000rpm on flat highway and asuming I get 30mpg at 60mph, that means I used 2 gallons in one hour of driving at 2000rpm...correct? So if my idling RPM is 1000rpm, then am I correct to say that I'll use 1 gal for every hour I'm idling. So if I idle my car for 10min every morning, then every 6 days I've used a gallon of gas. Replies to this message: gagrice (Dec 21, 2005 7:52 am) rorr (Dec 21, 2005 8:55 am) bobw3 (Dec 21, 2005 10:33 am) and 5 more...
#500 of 519 Re: General MPG question [bobw3] by gagrice Dec 21, 2005 (7:52 am)
Replying to: bobw3 (Dec 21, 2005 7:49 am) if the RPM is a constant 1500 then the gas used would be the same...correct? I don't believe so. It requires more fuel as the load increases. You can maintain the same RPM and use more fuel climbing a hill than idling at the same RPM. Replies to this message: rorr (Dec 21, 2005 8:55 am) bobw3 (Dec 21, 2005 10:33 am) rorr (Dec 21, 2005 11:24 am) and 4 more...
#501 of 519 Re: General MPG question [gagrice] by rorr Dec 21, 2005 (8:55 am)
Replying to: gagrice (Dec 21, 2005 7:52 am) "It requires more fuel as the load increases." Correct. Sitting in your driveway, you would need to apply very little throttle to rev the engine to 2k rpm in neutral. With really tall gearing and overdrive, one could be traveling in excess of 80 mph (in some cars) at 2k rpm. Obviously, the rate of gas consumption (measured in gallons per hour) would be higher than just sitting in the driveway revving the engine in neutral (no load) at 2k rpm. Gas consumption is based more on throttle position than engine rpm. Replies to this message: bobw3 (Dec 21, 2005 10:33 am) rorr (Dec 21, 2005 11:24 am) bobw3 (Dec 21, 2005 2:04 pm) and 3 more...
#502 of 519 Re: General MPG question [rorr] by bobw3 Dec 21, 2005 (10:33 am)
Replying to: rorr (Dec 21, 2005 8:55 am) "Gas consumption is based more on throttle position than engine rpm. " Why? All that the throttle position does is increase RPM. That's why I'm confused. Regardless of the gearing, for ever revolution of the engine, the gas is sprayed into the cylinder, and spark plugs fire. So for any given revolution of the engine, the same amount of gas is sprayed into the cylinders, regardless of whether you're at idle or climbing a hill. Or does the fuel injectors spray a greater quantity of gas into the pistons if the engine is under a load?? That would be the only way that the extra load would mean more gas is used for a constant RPM. My understanding is that it's only the increased RPM that makes gas usage higher. And I'm not talking about MPG...miles per gallon, but gallons used per revolution. The mpg at idle is zero, but I'm trying to calculate how much gas is actually expended at idle, so I'm calculating a gallon per RPM. Replies to this message: rorr (Dec 21, 2005 11:24 am) bobw3 (Dec 21, 2005 2:04 pm) rorr (Dec 21, 2005 2:51 pm) and 2 more...