My fuel mileage hasn't been amazing - Page 4 - Drive Accord Honda Forums | radio-pro.ru
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post #46 of 60 Old 05-04-2016, 10:36 AM
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...The accord is not a sports car.
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post #47 of 60 Old 05-04-2016, 11:17 AM
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Try this calculator using different humidity,temp,air pressure etc.



Play around with it using Denver as elevation, 30°F 25% RH, etc, and change the air pressure. This will tell the affect they all have on engine performance,efficiency, etc.

Most cars I believe will adjust for the pressure changes using the MAP (mass air pressure) adjustment, but I don't think that anywhere does the engine accommodate for humidity changes.

This calculator seems to explain all the inputs that may affect what we see.

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post #48 of 60 Old 05-04-2016, 12:54 PM
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These calculators are fun. Magazines often use them to “density altitude” adjust all performance figures. These calculators are typically used for WOT applications in which 100% of the car’s power is being evaluated.

I’d be curious to learn what impact these numbers have under light load, like highway fuel economy. Just like how a baseball will travel farthest at high elevation with high temperatures and high humidity, cars should get slightly better fuel economy under the same conditions. Conversely a car should get it’s worse fuel economy at low elevation in cold, dry air.

You mentioned humidity. High humidity is odd because it is good for fuel economy but bad for horsepower. Most of our atmosphere is composed of nitrogen and oxygen. Because of the hydrogen in H20, water vapor is significantly less dense than 02 or N2.

Therefore the more water vapor you have in the air the less dense it becomes and imposes less friction on objects traveling through it. That’s good for fuel economy. But humidity is also bad for max horsepower. For max power you want the most oxygen in the air you can get. You want low humidity. High humidity hurts power output, as confirmed on that calculator. But with humidity, what is good for power is bad for fuel economy.

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post #49 of 60 Old 05-04-2016, 02:03 PM
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MY 2016 EX-L CVT gets consistently 30 mpg on my mixed traffic 12 mile commute (ECO off) and I get 39+ if all highway w/ ECO on (avg 70 MPH or so).

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post #50 of 60 Old 05-05-2016, 09:22 AM
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We recently completed a long trip to the land of cheese in our '15. Mixed driving was 30.8. All highway was 34.6. This is cruising in the upper 70's, several passes of vehicles on 2 lane country roads. Over all very impressive.

MPG during the first 1000 miles (4 months time) of mixed driving was 23-27 mpg. It seems like things improved after that.

No fuelly here but I do keep a spreadsheet. The numbers in yellow are the important ones


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post #51 of 60 Old 05-06-2016, 07:59 AM Thread Starter
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dang, I just hit 1000 miles in the first 10 days


Fuel efficiency is improving every day. Routinely getting over 30+ mpg on the way to work now, and better if I'm going to band practice up in the suburbs. Around town is just below 30mpg.

Still enjoying the CVT and lack of shifting.
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post #52 of 60 Old 05-06-2016, 08:12 AM
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Originally Posted by GPz1100 View Post
We recently completed a long trip to the land of cheese in our '15. Mixed driving was 30.8. All highway was 34.6. This is cruising in the upper 70's, several passes of vehicles on 2 lane country roads. Over all very impressive.

MPG during the first 1000 miles (4 months time) of mixed driving was 23-27 mpg. It seems like things improved after that.

No fuelly here but I do keep a spreadsheet. The numbers in yellow are the important ones
Are the 87 and 93 numbers indicative that you're running 87 and 93 octane fuel? You could have a few bucks and just put 87 in it. 93 will do nothing extra for your car.


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post #53 of 60 Old 05-06-2016, 08:23 AM
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Quote:
Originally Posted by GPz1100 View Post
We recently completed a long trip to the land of cheese in our '15. Mixed driving was 30.8. All highway was 34.6. This is cruising in the upper 70's, several passes of vehicles on 2 lane country roads. Over all very impressive.

MPG during the first 1000 miles (4 months time) of mixed driving was 23-27 mpg. It seems like things improved after that.

No fuelly here but I do keep a spreadsheet. The numbers in yellow are the important ones

I see you alternate tanks between premium and regular gas. I used to do that in a 1992 Acura Legend because in the Acura "Premium Gas" was recommended. I definitely saw less of a performance degradation doing the alternate tanks, rather than go straight regular. In the early 2000's, Car and Driver took a bunch of cars, some that ran on regular and some that ran on premium and tested them each with regular and premium. I noticed back then, that the Accord they used actually performed worse on Premium than it did on Regular (I think 0-60 and HP wise). That was then. Not sure if this would be the case now.



"The Accord took a tiny step backward in power (minus 2.6 percent) and performance (minus 1.5 percent) on premium fuel, a phenomenon for which none of the experts we consulted could offer an explanation except to posit that the results may fall within normal test-to-test variability."

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post #54 of 60 Old 05-06-2016, 08:43 AM
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Eh, why not. 2nd and 3rd prev are the same tank, accidentally reset on a monday morning, so I now have record of a weekend (150) compared to M-F work commute plus errands (466).
TMVB I honestly AM curious to know what I'd do with CVT.
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Current vehicle:
2014 Honda Accord LX 6MT 103K
easy mods and changes:
*55W HID lowbeam 5000K (Innovited upgrade kit)
*LasFit 9005 HB3 highbeam / DRL 6500k
*Interior trunk handle
*Trunk cargo net
*All weather floor mats from College Hills Honda
*Gutter Guards behind lower grille

Previous vehicles:
2001 Chevy Prizm 3AT (given away, it was a terrible car...)
1995 Honda Accord DX 5MT (wrecked at 240K)
1989 Honda Civic LX 4AT (wrecked at 180K)
1988 GMC Sierra 1500 5MT (sold at 80K)
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post #55 of 60 Old 05-06-2016, 09:14 AM
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Lets not turn this into another fuel grade debate thread.

easymike, those are some impressive numbers. If only I could go 65 or less

A mechanic friend told me if the car was to lose it's emission control devices, mpg numbers would be 60+.

Suffice to say, the last time I saw mpg above was was when I had my bike.
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post #56 of 60 Old 05-06-2016, 10:55 AM
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A mechanic friend told me if the car was to lose it's emission control devices, mpg numbers would be 60+.
So many regulations are in place for vehicles, plus everyone wants a sportscar. When you consider that a 90hp civic from 1989 could get 35-40mpg on a long trip, and a 185hp accord from 2016 can do about the same, why don't we see a 90hp vehicle getting 70-80mpg instead on gasoline alone? We have all this added power to overcome emission control devices, when wouldn't it be better to reduce our carbon emissions by more than 50% in exchange for a marginal increase in other byproducts? No emission control device can remove CO2 from exhaust, that comes from burning less fuel only.
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Current vehicle:
2014 Honda Accord LX 6MT 103K
easy mods and changes:
*55W HID lowbeam 5000K (Innovited upgrade kit)
*LasFit 9005 HB3 highbeam / DRL 6500k
*Interior trunk handle
*Trunk cargo net
*All weather floor mats from College Hills Honda
*Gutter Guards behind lower grille

Previous vehicles:
2001 Chevy Prizm 3AT (given away, it was a terrible car...)
1995 Honda Accord DX 5MT (wrecked at 240K)
1989 Honda Civic LX 4AT (wrecked at 180K)
1988 GMC Sierra 1500 5MT (sold at 80K)
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post #57 of 60 Old 05-06-2016, 11:02 AM
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From 1989 to 1999, my I4 Accord has 150 HP (I think?) and only gets about 28 MPG versus that Civic. Why? Probably because it's an "Ultra Low Emissions Vehicle" -.- But now, compared to my car, these newer cars are built WAY more conformant to emissions, so my car's low emissions "engineering" doesn't mean anything anymore, really...yet they have even more HP.

People say the F-body was "ruined" in the 90's by emissions controls for the same reason. They have more horsepower, but they also have so many controls and sensors that can break and hamper performance, it's ridiculous.


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post #58 of 60 Old 05-06-2016, 11:52 AM
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Quote:
Originally Posted by easymike View Post
why don't we see a 90hp vehicle getting 70-80mpg instead.
55 to 60 mpg is probably realistic. This is for the 6MT European Civic 1.4-liter with 97hp.



49 mpg hwy (US gallon). 35 mpg city. 0-62 in 13.5 seconds.


This is for the 6MT European Jazz 1.3-liter with 99hp.



55 mpg hwy (US gallon). 38 mpg city. 0-62 in 11.2 seconds.

I’m not sure what speed their “Extra Urban” is, but their Jazz gets about 15 mpg MORE on the highway than our Fit and their Civic gets about 10 mpg more on the highway than our Civic.

That is based on their “stated” economy. If Honda is the same in Europe as in the US, those cars may return better fuel economy than "stated" in real life. Smaller engines have benefits.

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post #59 of 60 Old 05-06-2016, 12:13 PM
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Originally Posted by enne View Post
From 1989 to 1999, my I4 Accord has 150 HP (I think?) and only gets about 28 MPG versus that Civic. Why? Probably because it's an "Ultra Low Emissions Vehicle" -.- But now, compared to my car, these newer cars are built WAY more conformant to emissions, so my car's low emissions "engineering" doesn't mean anything anymore, really...yet they have even more HP.

People say the F-body was "ruined" in the 90's by emissions controls for the same reason. They have more horsepower, but they also have so many controls and sensors that can break and hamper performance, it's ridiculous.
Technology is an amazing thing. And yet all this wonderful technology did was to increase the engine’s thermal efficiency from 34% to perhaps 35%. It’s sad to think about how much gasoline is wasted to entropy. Essentially 2/3 of every gallon is wasted. The engine with the highest thermal efficiency today is this little Toyota engine - 38%. Still a sad figure.


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post #60 of 60 Old 05-06-2016, 02:32 PM
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I think you guys are doing it wrong



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