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Honda Accord Real World MPG

2672 messages,  Last post on Nov 23, 2009 at 2:36 PM

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What is this discussion about? Honda Accord, Fuel Efficiency (MPG)

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#2409 of 2672 . by dudleyr Oct 09, 2008 (2:00 pm)
In response   I run about 40psi in the tires.   I use mobil 1 0w 20 oil.   I also only use 100% gasoline. No ethanol and no winter additives.
#2410 of 2672 Re: MPG for the I4 MT,,, [ezshift5] by malmouza Oct 10, 2008 (9:09 am)
Replying to: ezshift5 (Oct 09, 2008 1:34 pm) On my daily commute, 20% city and 80% highway I get 33 MPG early in the morning and 37 to 41 MPG in the afternoon. The distance is 13 miles each way. The only explanation to the difference in MPG for both directions is the wind and the temperature, as the route is free of hills. There is one thing I would like to know if heating the gas line will improve the gas mileage, as the gasoline evaporate a lot faster in hot weather, and by consequence ignite a lot faster. This situation is more noticeable when we have to commute a short distance, as the engine does not burn the fuel efficiently until it reach a specific temperature, my guess for any distance less than 18 miles, the MPG will be less than satisfactory. So it does help if you have a warm garage where you park your car overnight. Another thing that manufacturer need to think about it, is to have the radiator vents on the bumper, and the hood, closed when the engine is cold, and they should open automatically when the engine reach certain temperature. This will not cost a lot, but it will help the gas mileage, for people that they have a short commuting distance, or they live in cold weather states. Replies to this message: kiawah (Oct 10, 2008 10:24 am) thegraduate (Oct 10, 2008 3:45 pm) malmouza (Oct 10, 2008 5:37 pm) kiawah (Oct 10, 2008 8:02 pm) and 1 more...
#2411 of 2672 Re: MPG for the I4 MT,,, [malmouza] by kiawah Oct 10, 2008 (10:24 am)
Replying to: malmouza (Oct 10, 2008 9:09 am) More likely to be your anxiousness and speed in getting 'home' from work, as opposed to you dragging in going to work.   Mixture is all computer controlled within the engine, and your engine would be up to correct normal operating temperature within a couple minutes. I'm up to temperature before I leave the development in the mornings. Replies to this message: thegraduate (Oct 10, 2008 3:45 pm) malmouza (Oct 10, 2008 5:37 pm) kiawah (Oct 10, 2008 8:02 pm) malmouza (Oct 10, 2008 8:42 pm)
#2412 of 2672 Re: MPG for the I4 MT,,, [kiawah] by thegraduate Oct 10, 2008 (3:45 pm)
Replying to: kiawah (Oct 10, 2008 10:24 am) Haha... um, one problem. They get much better mileage in the afternoon.   My question; how do you do mileage in such a short commute?
#2413 of 2672 Woopsie. by tankbeans Oct 10, 2008 (5:36 pm)
Hey all-   Haven't posted in awhile. My last few tanks have been BAD. This last tank was 23.8 or thereabouts. I know what did it though.   I've moved about 10 miles closer to work instead of 19 I'm now just over 9 and there were a good number of 6100+ rpm acceleration events, with some aggressive passing.   What can I say? I've gotten a little lax? With winter coming I think this is going to be the norm.   I'm going to go back to my little game with myself, which is to say that I want to crack 30 again, before winter. It will be very difficult. Stupid E10. Replies to this message: blufz1 (Oct 10, 2008 6:22 pm)
#2414 of 2672 Re: MPG for the I4 MT,,, [kiawah] by malmouza Oct 10, 2008 (5:37 pm)
Replying to: kiawah (Oct 10, 2008 10:24 am) You are wrong; the normal temperature will not be reached in a few minutes. The fact that your heater start blowing hot air in 3 minutes does not mean the engine is hot enough to operate efficiently. I worked on mechanic and I study thermodynamic, in cold weather the oil does not flow fast enough, or get pumped easily, in the engine, this include the oil in transmission too. When the oil is not viscose enough to move freely around the parts, the engine parts do not get lubricated completely, which put a lot of stress on the engine and by consequence, the gas consumption goes up. Heat can be considered as enemy and friend at the same time of any combustion engine. Too much heat and you can destroy your engine, and an engine not hot enough will not operate efficiently. This is not me talking, this mechanic 101. Have nice day. Replies to this message: kiawah (Oct 10, 2008 8:02 pm) malmouza (Oct 10, 2008 8:42 pm)
#2415 of 2672 Re: Woopsie. [tankbeans] by blufz1 Oct 10, 2008 (6:22 pm)
Replying to: tankbeans (Oct 10, 2008 5:36 pm) Your mileage has decreased because your trips at operating temperature have decreased. You also have more engine start cycles per tank.
#2416 of 2672 Re: MPG for the I4 MT,,, [malmouza] by kiawah Oct 10, 2008 (8:02 pm)
Replying to: malmouza (Oct 10, 2008 5:37 pm) Take a look at this article, it'll give you an overview of internal engine operations....there's a fair amount of info regarding the energy available in fuel, and the relatively low percentage of energy that is actually used to propel the vehicle...versus....the majority of energy wasted and dispersed as excess heat and exhaust. Fuel burns in the cylinder at 4000 degrees.   Internal Engine   You can also buy a software program and adapter to plug your laptop into your OBD2 port, so you can track/plot your engine parameters. You can see just how quick your engine actually comes up to normal operating parameters. It's a little pricey, but if you want a more limited (but cheaper) alternative.....buy a carchip from alltrackusa. It will allow you to track 4 of approximately 20 engine parameters, including things like engine temperature, fuel trim, O2 sensors, throtlle position, engine load, etc. Runs about $150 if I remember correctly, records every 5 seconds, and also plugs into your OBD2 port.   Track your engine, you'll see factually how fast it gets up to normal operating parameters. It will take transmission oil longer to get up to temperature, obviously.     Have a nice day Replies to this message: malmouza (Oct 10, 2008 8:42 pm)
#2417 of 2672 Re: MPG for the I4 MT,,, [kiawah] by malmouza Oct 10, 2008 (8:42 pm)
Replying to: kiawah (Oct 10, 2008 8:02 pm) So you know how to use the search engine Google!!! I do not think that link you provided contradict in anyway my explanation. I own two hand held computers that plug right into the OBD2, they give me a real time data. But in your response you just contradicted yourself, you agree that the transmission oil need more time to reach the optimum temperature, and at the same time you disagree the engine need more time to heat up???? Isn’t the engine also has also oil to keep the friction to a minimum? The transmission is connected to the engine, as the engine heat up so does the transmission, if you drive a car in bellow freezing temperature weather the engine will have a hard time to reach the optimum temperature, as the vents in the front bumper of the engine are open, and they keep the engine from reaching the required operating temperature. All the cars are designed on the basis that they can withstand the heat for a long period of time, but they are not designed for a short commuting; which we do notice in some used cars with low mileage but with abused engine.
#2418 of 2672 Engine block heater. by kipk Oct 11, 2008 (3:30 am)
Next door neighbor keeps his Ridgeline in an enclosed garage, that is attached to the house. There are no heat vents in the garage, but it stays reasonably warm just from house heat escaping, through the walls and door.   At 25-30 degrees outside temperature, his Ridgeline temp gauge will get to operating temperature just before reaching the end of our street. About 1.4 miles. My Pilot is under an open carport, and requires nearly 2.5 miles to reach operating temp, according to the gauge.   With outside temps of 50-55, the Pilot will reach the operating temperature within the "end of street" measurement. At 80 degrees or so, the distance is very short.   Note: It does not make sense to me that a 20-25 degree swing in outside temp would make that much difference, but it does with our experiences.   Most of us realize that a cold engine runs "Richer" than a warm one. Thus, short commutes generally get poorer mileage than longer ones, under similar traffic conditions.   Does it seem reasonable that an engine block heater might be a reasonable way to prepare or keep the engine at a better temperature for early morning starts ? Or would the electricity used cost more than the extra fuel required to run the "c~o~l~d" engine.   Kip

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