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Discussion Starter #1
Hi guys
Lots of discussion about the speedo over reading on here at the moment. I just wondered that as the speedo is made to over read on purpose and that the trip meter is accurate (else our cars do far less mileage than the speedio says) Does this mean that the computer MPG readout is fairly accurate as it pressumably uses the trip and not the speedo to work out the fuel used? Or am I wrong about this?
 

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Hi guys
Lots of discussion about the speedo over reading on here at the moment. I just wondered that as the speedo is made to over read on purpose and that the trip meter is accurate (else our cars do far less mileage than the speedio says) Does this mean that the computer MPG readout is fairly accurate as it pressumably uses the trip and not the speedo to work out the fuel used? Or am I wrong about this?
As with most cars if you subtract 3mpg from the computer read out you will arrive at a fairly accurate figure.
This is confirmed by my manual log of mileage and fuel.
 

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Really? I worked mine out to be almost bang on. It says about 34 and my calculations have said about 33.5 so it's only half a mile out.
Not had the car long and it's only over 3 tanks.
 

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I've had two cars with mpg trip computors an 05 Civic and an 09 Civic over a period of time the actual mpg calculated from fuel added and mileage is about 5 mpg less than shown on the trip computor.

I have found that some pumps cut off earlier leaving the tank not quite full and for the odd fill-up the calculated mpg is higher than the trip computor, but using a different pum the next time evens things out. You need about six months of fill-up data to obtain a meaningful average mpg.
 

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shameless
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now if you had a primera you'd be doing more than the computer says as the nissan ones are pessimistic
 

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We tend to work out the mpg on a weekly basis tbh and in the summer months its fairly good to within half a mile id say. In the colder months its a little further out but its still not bad at all imo.
 

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Really? I worked mine out to be almost bang on. It says about 34 and my calculations have said about 33.5 so it's only half a mile out.
Not had the car long and it's only over 3 tanks.
As I said before I log all petrol and mileage but I only go from full tank to full tank and over 28000 miles it calculates to 37mpg compared to car reading of 40mpg.
 

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Administrator
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I can concur with Jazzman. I also keep a spreadsheet going and 3 mpg is what I'm finding as well.
 

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Mugenised CR-Z GT
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I'll post the Honda bulletin regarding this when I'm not on the iPad
 

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Dr. Evil
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Mine was 10mpg out when I did a brim-to-brim recently. Don't know if that's anything to do with the remap or not though.
 

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Mugenised CR-Z GT
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Honda's Explanation of the trip computer
 

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Premium Member
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I never work out my MPG infact I never look at it or I'd cry almost every day!
 

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Quit yo Jibba Jabba
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We tend to work out the mpg on a weekly basis tbh and in the summer months its fairly good to within half a mile id say. In the colder months its a little further out but its still not bad at all imo.
Same here, right now it's bob on...
 

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Hmm I wonder if it makes a difference what model of civic you have. Got through a fee more tanks now and it's still pretty accurate.
 

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As with most cars if you subtract 3mpg from the computer read out you will arrive at a fairly accurate figure.
This is confirmed by my manual log of mileage and fuel.
Pretty much exactly spot on with every car i've owned with a mpg meter, 2 Type-R's and a Punto Turbo diesel.
 

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My AVG fuel consumption meter displays always at LEAST 0.6-0.8l less, than the reality.
For example, if the display shows 7.5l/100km, the reality is definitely more than 8.2-8.3l/100km.
I was wondering if it was possible to re-calibrate it, or make it more precise using a firmware update?
 

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never worked it out but i cant get my 2.2 type s showing more than 40mpg and thats driving daily to work 10 miles town and 35 motorway , without aaircon on , only had the car a month and a little disappointed
 

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I agree with the posts that the average fuel consumption is 3mpg less than the reading shown on the meter.

Just got back from a blast to Belgium and back for work and the readings were 46.1mpg / 43.7mpg / 42.6mpg while the actual amount of fuel used was 43.4/40.9/39.8

The first reading was me trying to be be economical on the motorway from home to Folkestone (no heavy acceleration and not going over 75mph). The second reading was European motorway and twisty stuff around Spa (certainly not much in the way of economical driving) and the third was fast Euro / UK motorway driving on my way home. Quite pleased with the results for a 1.8 petrol.

Now I know the reading is -3mpg, I can live with that.
 

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never worked it out but i cant get my 2.2 type s showing more than 40mpg and thats driving daily to work 10 miles town and 35 motorway , without aaircon on , only had the car a month and a little disappointed
You can go through the menu and have the A trip reset when the tank if refilled.
Otherwise they dont reset until you manually do it.
Perhaps yours is not on auto and is reading many, many miles average ?
 
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