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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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#1099 of 2058
Re: mpg reports NOT filter debates please [k5ldb] by ruking1
Aug 16, 2007 (8:00 am)
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Replying to: k5ldb (Aug 16, 2007 7:52 am)

Well more directly, what really happens is the A/C is (user) set to work and works harder in a darker car than in a lighter car. Whether it converts to hard data or not, it would need a side by side test and then the sample size would probably be too small.
#1100 of 2058
Re: mpg reports NOT filter debates please [k5ldb] by ras314
Aug 16, 2007 (11:03 am)
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Replying to: k5ldb (Aug 15, 2007 5:19 am)

Finally have enough miles on my manual 2007 Civic to get a pretty good idea of mileage. Ignoring the first tank from the dealer it has averaged about 43.6 mpg over 1110 miles, 650 hwy at 55 to 65 mph and 460 miles of short (15 mi round trips) mostly at slow speeds but few stop signs. Lowest tank was 42.7, highest 45.9.
 
I think the 45.9 was a direct result of watching the ScanGauge II. I'm still trying to find the "optimum" hwy speed, so far it looks to be quite low.
#1101 of 2058
Re: mpg reports NOT filter debates please [ras314] by blufz1
Aug 16, 2007 (12:01 pm)
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Replying to: ras314 (Aug 16, 2007 11:03 am)

Don't need a ScanGauge. The best mileage is obtained in top gear at the slowest speed you can go, 40-45. Don't lug the engine! It's just not safe to go that slow on the highway.
#1102 of 2058
Re: mpg reports NOT filter debates please [blufz1] by ras314
Aug 16, 2007 (12:44 pm)
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Replying to: blufz1 (Aug 16, 2007 12:01 pm)

Agree that 40-45 in 5'th looks best on level road and no head wind, otherwise not enough rpm. This is a surprise to me.
 
Any idea of the mileage difference between 55, 65 and 75? I'm getting a stupid urge to take a trip somewhere just to find out.
#1103 of 2058
Re: mpg reports NOT filter debates please [ras314] by blufz1
Aug 16, 2007 (1:33 pm)
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Replying to: ras314 (Aug 16, 2007 12:44 pm)

Be careful don't go too slow!! I would estimate 10% 55 to 65. 13% 65-75. Just guessing. It's the wind resistance.
#1104 of 2058
Re: mpg reports NOT filter debates please [blufz1] by jefferyg
Aug 16, 2007 (9:20 pm)
Reply

Replying to: blufz1 (Aug 16, 2007 1:33 pm)

I'll guarantee you if you slow it down you'll do MUCH better. I've already observed that. I also think the A/C is a really big factor. When I got the outrageous mileage in my new Civic it was on a much cooler day at leisurely speeds (nothing above 70).
 
As I've said before, I can't wait until we get some cooler weather to see what kind of difference running with no A/C makes. With the 100+ temps we've been having over the past week and a half, I've had to run the A/C on Max almost constantly.
#1105 of 2058
Re: mpg reports NOT filter debates please [jefferyg] by blufz1
Aug 16, 2007 (9:38 pm)
Reply

Replying to: jefferyg (Aug 16, 2007 9:20 pm)

Estimate the a/c at 2-3 mpg.
#1106 of 2058
Re: mpg reports NOT filter debates please [jefferyg] by ras314
Aug 17, 2007 (4:16 am)
Reply

Replying to: jefferyg (Aug 16, 2007 9:20 pm)

I would expect the A/C to have a much bigger effect in slow speed city driving. I've only used it once so far, mostly rolling hills and couldn't really tell much effect. What does make a big difference is to not use cruse control in hilly country.
 
I usually drive under the speed limits at night without cruse control in my area, due to the animals on the road and light traffic. This results in considerable mileage improvement, from around 45 mpg daytime to near 50 at night over the same 100 mile stretch.
#1107 of 2058
Re: mpg reports NOT filter debates please [ras314] by jefferyg
Aug 17, 2007 (4:53 am)
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Replying to: ras314 (Aug 17, 2007 4:16 am)

45 mpg daytime to near 50 at night over the same 100 mile stretch.
 
Dude, what are you driving? That's incredible - day or night.
 
I totally agree with you on the cruise control. I took about a 165 mile trip yesterday evening. I watched the tach and tried to keep it at or below 2000 rpm. I still had well over half a tank when I got home. However, my wife is driving the car to school today. She can negate my 165 miles of frugality with one 15 mile round trip to school.
 
A hybrid would probably do very well on her daily commute. The trip she makes each day is constant stop and go, uphill and down on mostly backroads.
#1108 of 2058
Re: mpg reports NOT filter debates please [jefferyg] by ras314
Aug 17, 2007 (7:36 am)
Reply

Replying to: jefferyg (Aug 17, 2007 4:53 am)

Car is a 2007 Civic LX, manual with 1500 miles now. I would sure like to know how the hybrids would do on the same road. A lot of 15 mile round trips to town is what drops my average to something like 42-43 mpg. While not much stop and go a hybrid seems more appropriate for that type use.
 
2000 rpm seems to be too low, 2500 to 3000 works better to keep from lugging the engine with any headwind or uphill grade.
 
Any rate, I am happy with the Civic.

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