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Maintenance & Repair Hybrid Vehicle Maintenance, Repair and Concerns
133 messages, Last post on Nov 16, 2009 at 3:58 PM
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I'd like feedback to that question also. I see the engine go to auto stop when i come to a stop (which is often since i drive short trips in the city. I'm up to about 800 miles and am still only getting about 27-29 mpg. true most of my trips are under 5 miles. is that the main reason? i do notice when i go on slightly longer drives within the city, it goes up to low 30's. but it may be that i am just driving such short distances i will never see a significant increase in mileage. i am going to have to consider riding a bike more often.
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Replying to: envirofriend (Mar 13, 2009 8:07 pm) Once you hit about 3,000 miles or so, go on a freeway trip for 100-200 miles and I bet you'll see a big jump. As your car breaks it, even short trip mileage should increase but 5 mile trips are not easy on a car's fuel economy. If you were driving ALL DAY in the city, that would improve things because the car's properly warmed up. |
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Replying to: george128 (Mar 13, 2009 5:54 pm) The HMA system uses electric motors in the drivetrain, to assist the gasoline engine. To my mind that means there is no way for the car to run on electric only (it would essentially be running the engine, which is connected to the drivetrain - unless they somehow uncoupled the automatic transmission). The Internet articles I've read indicate the IMA cannot run on electric only. The advantage of this system is that it doesn't require a lot of hybrid-specific changes to the vehicle (it is essentially an add-on to the current transmission), and therefore costs less than a "two-mode" hybrid, which is capable of running on electric (for a short distance), hybrid-electric, or gasoline. I had thought that the IMA only turned off the engine at stops. Anyone else?
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Replying to: stevedebi (Mar 15, 2009 8:47 pm) The IMA has an electric motor attached to the engine output shaft which 'assists' the motor to run more efficiently, ergo the Integraged Motor Assist ( IMA ) nomenclature. AFAIK it is not possible for the IMA vehicles to drive on electric power alone, except maybe at startup from a dead stop for a very very short distance ( meters ). OTOH the very elegant engineering solution that Honda has created is less expensive and more compact than Ford's or Toyota's or GM's so it's well suited to smaller and less expensive vehicles, the Civic hybrid and the Fit hybrid ( Insight II ). |
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My 08 Civic Hybrid with 35K miles has burned through the OEM Dunlop tires averaging just over 50mpg (calculated using overflow fill-ups). Mileage was increasing with tire wear--the last 4K miles on them averaged just over 53mpg. I have replaced with the Dunlops with an 80K mi.Yokohama tire running at a little higher pressure and my mileage has gone in the tank--averaging 46mpg over first thousand miles. Is it these tires, new tires, or can someone offer some other arcane explanation? dber |
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Yes. I replaced the stock dunlops with costco michelin x radials, my mpg dropped from 40~ to 32~ overnight. With 3000 miles break in I have no improvement running 32psi, then 40psi. Run the dunlops |
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Replying to: dber (Apr 08, 2009 9:20 am) Watch after 5000 miles.
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Replying to: kdhspyder (Apr 08, 2009 3:09 pm) I would expect that loss to be permanent. If the replacements are less efficient, then I would fully expect the drop to be permanent. By less efficient, I mean in terms of rolling resistance. I have seen estimates of from 2%, up to 25% of total fuel economy. That indeed seems like a very wide varience. |
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Replying to: kdhspyder (Apr 08, 2009 3:09 pm) I have now over 5000 miles on my costco michelin x radials. MPG when pulling in to replace tires, average 40-43mpg, straight highway driving at 60-65mph 43 constant, one trip to san diego from los angeles doing 60mph was 58mpg, 118 miles traveled about 2 gallons of gas. The next tank 30mpg, now 4 months later over 5000 miles at 32mpg~. On a 3000 lbs car the actual tire losing less than an ounce or two of weight has no scientific or practical reasoning to gain back 10mpg. The costco michelins saved me about $150 over the dunlops. Each tank of gas with the michelins is costing me $8 more, In 4 months I have allready lost my savings on the cheaper tire, and used up non-reusable natural resources. The stock dunlops rock! If I wasn't so broke I would go to americas tire and get the 4 stock dunlops.
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Replying to: xkmail1 (Apr 10, 2009 10:13 am) But live and learn. I guess you could switch back to original tires to prove or disprove the theory. |
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