Low MPG - 2.2 i-DTEC Auto - Civinfo
 
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post #1 of 15 (permalink) Old 16th November 2010, 22:08 Thread Starter
 
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Unhappy Low MPG - 2.2 i-DTEC Auto

Hi All,

This is my first post and my first Honda so please excuse my ignorance. I have not long brought a 2.2 I-DTEC Auto, EX Accord with 5000 mile on the clock.

I use the car as a opt out to a company car and i am struggling with the MPG return. I drove a return journey on the motorway (150 each way) and on one leg returned 37.8mpg and the second 40.1mpg.

I had been cruising at 70mph up the M40 using both cruise control and me foot. Is there something wrong with the car?

My VW Jetta returned 60mpg - i understand the Honda will only do 54-55mpg but i can't get near this. Help anyone???

Cheers Jay
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post #2 of 15 (permalink) Old 17th November 2010, 00:09
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That is a bit strange. If it was the iCTDi engine I'd have said maybe cracked manifold, but I'm afraid I don't know much about the iDTEC so don't know if that's an issue.

Are there any other symptoms at all, or just low MPG? Any strange noises, hesitation etc?
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post #3 of 15 (permalink) Old 17th November 2010, 00:21
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i dont know the car but an auto will usually get quite a bit less than manual also mpg will increase as you get some miles under the belt, if it has dpf (i suspect it will) during a regen you can expect lower mpg as well, i only get 35mpg from mine but it does get used with panache
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post #4 of 15 (permalink) Old 17th November 2010, 02:06
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I've never driven an auto, so no idea about lower MPG, but the DPF comment is a very good point, the 37mpg could well have been during a regen cycle.

On my motorway trips, I get anywhere between 47-50mpg, sometimes more, so I can't see how you should get a whole lot less. I still think you've probably got some kind of issue, never known a 2.2 diesel to give mpg in the 30s on a motorway :/
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post #5 of 15 (permalink) Old 17th November 2010, 13:37 Thread Starter
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Guys,

Thanks for the suggestions. Driving wise this car is smooth, and very quiet. Response wise again flawless, just can't get the mpg up. I have noticed that the miles till empty for the fuel is up and down like a yo yo?

This has the dpf fitted to it. On my jetta I had a spider diesel tuning system, looks like I'm going to have to get one for this.

I have also contacted honda so I will update to their response.
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post #6 of 15 (permalink) Old 17th November 2010, 13:57
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Quote:
Originally Posted by james2512 View Post
Guys,

Thanks for the suggestions. Driving wise this car is smooth, and very quiet. Response wise again flawless, just can't get the mpg up. I have noticed that the miles till empty for the fuel is up and down like a yo yo?

This has the dpf fitted to it. On my jetta I had a spider diesel tuning system, looks like I'm going to have to get one for this.

I have also contacted honda so I will update to their response.

Does sound like an issue, but on a side not was your mpg on the jetta from the computer, or from working out the miles travelled on a full tank etc?

If you were running a tuning box and are relying on the comp for your mpg it will have been well out on the Jetta
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post #7 of 15 (permalink) Old 17th November 2010, 14:48
 
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Eco display Eco display
tyre pressures ok?
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post #8 of 15 (permalink) Old 17th November 2010, 18:33 Thread Starter
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tyre pressure is good, and im taking the mpg reading off the screen. I did wonder if it was right at all?

I have managed to drive around 400 mile on half a tank in the Accord, so i may just be the display is incorrect?

Im off on another 350 mile journey tomorrow and ive just been and brimed the tank! Wait and see what happens.
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post #9 of 15 (permalink) Old 18th November 2010, 00:20
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sounds like it! do a brim to brim test see what that says
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post #10 of 15 (permalink) Old 18th November 2010, 20:00 Thread Starter
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Right,

Just done another 350 mile trip, i brimmed the tank and the trip is now reading 44.5mpg, which is much much better. Again just under a qtr tank to complete the trip.

Car must of been having a bad day! I am still awaiting Honda's response.

Keep you all posted.
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post #11 of 15 (permalink) Old 18th November 2010, 22:29
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44 is the combined figure for that car, so actually getting that figure is normally considered a success. Many road tests report 31 to 34, so it clearly has a bit of a thirst (my 170 bhp E class Merc slushbox automatic does a good 55 on the motorway, and any DPF regeneration has no noticeable effect with mpg).

A couple of considerations at the moment are that the cold weather really hurts diesel mpg, and your car won't be at its most efficient until 10,000 miles or so.

When you brimmed it, did you get an accurate record of the number of miles you did and the amount of fuel you put in?
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post #12 of 15 (permalink) Old 19th November 2010, 17:17
 
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Bizarely my MPG has improved now that the weather is cold. During the summer I was lucky to get 43 over a tankful and now get 47 - same average journey just different conditions. Mileage is a little over 24K so the car was well and truly worn in a little while ago.

As the Americans might say - go figure?

Regards,
Chris
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post #13 of 15 (permalink) Old 21st November 2010, 17:50 Thread Starter
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Guys,

I am going to keep a full record over a full tank vrs the miles done to see how they stack up.

Still no word from honda!!! Grrr
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post #14 of 15 (permalink) Old 21st November 2010, 20:00
 
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I think you're getting about right for a car of the size, weight and auto.

I have the Type-S and average around 43 with a mix of M/Way, A Roads and a fair amount of stop start.

Highest I've every seen was 48 and I was driving like a granny!!

HTH
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post #15 of 15 (permalink) Old 21st November 2010, 23:01 Thread Starter
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i may take the car upto the guys at Spider Diesel Tuner and let them work some magic.
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