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Hybrid Vehicles Hybrid Vehicles - Archived Discussions Hybrid Gas Mileage Good? Bad? As Expected?
519 messages, Last post on Jan 16, 2007 at 6:14 AM
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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 !! 
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Replying to: larsb (Dec 20, 2005 9:13 am) |
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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.
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Replying to: robert47 (Dec 20, 2005 11:28 am) |
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Replying to: robert47 (Dec 20, 2005 11:28 am) |
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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.
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Replying to: bobw3 (Dec 21, 2005 7:49 am) 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.
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Replying to: gagrice (Dec 21, 2005 7:52 am) 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.
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Replying to: rorr (Dec 21, 2005 8:55 am) 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.
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Replying to: bobw3 (Dec 21, 2005 10:33 am) But how do you think it increases rpm? Increased throttle position increases the amount of fuel/air injected into the cylinder, hence more torque is generated, and the rpm increases (assuming there is no load on the engine keeping it from increasing in rpm). "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." No. Forget hills/idle/etc. Picture two identical cars, identical gearing, identical EVERYTHING, both driving down a level road at the same exact vehicle speed and engine rpm. Since both cars have the same engine rpm, they should both be getting the same mileage, right? But what if car 'A' is pulling a 5000 lb. trailer? Under your theory, they are identical vehicles with identical engines turning identical engine rpm so they should get the same mileage.....do they?
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