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Honda Civic Real World MPG

2058 messages,  Last post on Aug 26, 2009 at 6:19 PM

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


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#1152 of 2058
Re: gasoline purchase time of day [k5ldb] by blufz1
Aug 29, 2007 (4:50 pm)
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Replying to: k5ldb (Aug 29, 2007 11:08 am)

Has the morning fill vs the evening fill been quantified in percentages? Thanks.
#1153 of 2058
Re: gasoline purchase time of day [blufz1] by k5ldb
Aug 29, 2007 (5:18 pm)
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Replying to: blufz1 (Aug 29, 2007 4:50 pm)

I don't know if there's specific percentage information however there is a lot of controversy over this in the trucking community where purchases of 100+ gallons every day or two is the norm.
#1154 of 2058
Re: gasoline purchase time of day [k5ldb] by blufz1
Aug 29, 2007 (6:27 pm)
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Replying to: k5ldb (Aug 29, 2007 5:18 pm)

Thanks,man.
#1155 of 2058
Re: gasoline purchase time of day [blufz1] by kiawah
Aug 29, 2007 (7:10 pm)
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Replying to: blufz1 (Aug 29, 2007 6:27 pm)

Tanks underground are about 55 degrees. It's not going to matter very much what time of day you pump it. How soon after the station gets a delivery would be a larger variable, I believe.
#1156 of 2058
overfilling by targettuning
Aug 30, 2007 (4:22 am)
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The reason for not overfilling (assuming no one has touched on it) is that the evaporative canister that collects fuel vapors and returns them to the tank at regular intervals has a return valve near the top of the filler neck. If this valve is under water (fuel)when the command to open the valve for vapor to return to the tank occurs raw fuel will back flow into the cansiter. This will log a code, the check engine lamp will illuminate,and the vapor canister may need replaced. These are all possible and not worth the effort to squeeze in an extra 1/2 gallon. Remember the fuel system is now a closed loop.
#1157 of 2058
Re: overfilling [targettuning] by jefferyg
Aug 30, 2007 (5:05 am)
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Replying to: targettuning (Aug 30, 2007 4:22 am)

Thank you for the explanation!!!
#1158 of 2058
Re: Lower city mileage... [shipo] by eldaino
Aug 30, 2007 (7:48 am)
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Replying to: shipo (Aug 27, 2007 4:30 pm)

on the newer i-vtec engines, the lower rpm profiles are not as drastic in their cutover as the older ones where, where a specific rpm range was needed to be met before you would be in the 'high output' cams. i vtec smooths this over so that the changes are less apparent and brash, and it switches over to the higher cam profiles in a step fashion.
 
but at anyrate, i used to floor my civic all the time with relatively no harm to mpg. i mean, they werent the best tanks or anything, but it wasn't like 'oh man i can never floor it or keep it over a certain rpm range!'.
 
vtec has nothing to do with it; if anything its HELPING the r18 get better numbers, not worse ones. ANY car can have their mpg lowered by frequent blasts of acceleration in those sort of conditions.
#1159 of 2058
Re: Lower city mileage... [eldaino] by ruking1
Aug 30, 2007 (7:57 am)
Reply

Replying to: eldaino (Aug 30, 2007 7:48 am)

Another discussion point. I also follow on the Honda Civic (actually, all my cars) the concept of getting to so called cruising speed as soon as possible (briskly). I do not accelerate slowly to that point, unless road conditions warrant (slow acceleration). I continue to get the mpg posted in other posts.
#1160 of 2058
Re: overfilling [targettuning] by ruking1
Aug 30, 2007 (8:08 am)
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Replying to: targettuning (Aug 30, 2007 4:22 am)

For those folks who do fill way past first click off, it might be instructive to get a price for parts and labor to fix and/or replace the evaporative canister after a code is triggered.
#1161 of 2058
Re: overfilling [ruking1] by kork13
Aug 30, 2007 (9:43 am)
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Replying to: ruking1 (Aug 30, 2007 8:08 am)

My argument would just be that you're still buying that extra quarter gallon, and unless you're planning on driving through a region where you won't see a station for hundreds of miles, there's no reason to overfill it. It's not like you get any 'bonus' out of doing it.

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