poor MPG STILL... after changing so many parts

[jedi-knight83]

SO had my car back for a few days since its most recent trip to the garage.. feels like its been off the road more than on it at the moment.

This time I had to have the manifold flap adjuster motor changed.

Car runs SOOOO much better now and the power delivery is amazing (probably had been playing up for a while and caused the car to be sluggish and un responsive)

But my mpg is still terrible. Came home with the cruise on 80-85mph (revs 3000-3100 ish) and struggled to get 25mpg.

So far ive changed:
n75
n80
pcv
sparks
dv
flap adjuster motor
cam follower
air intake seals
fuel filter

looking for suggestions on other tests i can run or where to look next?

Thanks in advance.

[scopes]

have you tried resetting your trip on the wiper switch, if not try resetting it at 70 mph and that should give you a more precise reading...

Note to all as far as i have been made aware this should be done after any work has been carried out on the car...

Sounds funny, but it worked for me...

hope it helps!

 

So the flap adjuster motor helped  

[JMP]

have you tried resetting your trip on the wiper switch, if not try resetting it at 70 mph and that should give you a more precise reading...

Note to all as far as i have been made aware this should be done after any work has been carried out on the car...

If you are resetting it on the drive, all you are doing is clearing the start of the journey where youre getting up to speed which takes a lot of fuel. Precise reading? Nope, but if you like to look at smaller numbers then yes this is a good way to fool yourself 

For only a little work (no money needed), just knock your precat out. It will gain you some mileage. Also S3 IC helped out for me, but no point in doing that just for mileage. Clean airfilter helps too.

[56OctyVRS]

Try the reset as stated above. Failing that I can only think it might be your maf sensor playing up which causes poor mpg. I could only get between 27-30mpg on a steady driveblast night. As the weather is colder the mpg will drop due to the air being denser and the car injecting more fuel to compensate. I found switching back to the oem filter helped with mpg and no difference in performance from an aftermarket one.

[rich83]

To be honest... thats probably about right. I did a 2 hr journey a few nights ago. 3 people in the car and full boot. Avg. speed about the same as yours with a few booting sessions... and it did 26MPG.

[MC71]

I imagine at 80-85mph you will only see mid twenties. 60-65mph and you might see mid thirties. Have logged my petrol consumption on my ED30 since my ownership and (without looking right now) i think in the last year, on average I have achieved 27.8 mpg, albeit with my rather heavy right foot.

[bacillus]

I imagine at 80-85mph you will only see mid twenties. 60-65mph and you might see mid thirties. Have logged my petrol consumption on my ED30 since my ownership and (without looking right now) i think in the last year, on average I have achieved 27.8 mpg, albeit with my rather heavy right foot.

Usually on my 120 mile trips to Lincoln on the motorway I see between 30-33mpg at the "higher speed" but I'm frugal with the right foot.

Can I ask how many miles on the clock atm?

[john a]

About the same for me - maybe 31mpg over a 50 miles trip at around an indicated 80mph.

[GrayMK5GTI]

If it helps, the colder weather will hammer your MPG 

Mine is noticeably worse now the temps have dropped off. . .

[MC71]

I imagine at 80-85mph you will only see mid twenties. 60-65mph and you might see mid thirties. Have logged my petrol consumption on my ED30 since my ownership and (without looking right now) i think in the last year, on average I have achieved 27.8 mpg, albeit with my rather heavy right foot.

Usually on my 120 mile trips to Lincoln on the motorway I see between 30-33mpg at the "higher speed" but I'm frugal with the right foot.

Can I ask how many miles on the clock atm?

56k

When really trying, with cruise set at around 70 mph (according to the GPS) I get approx 34-38mpg on my monthly 150 mile motorway trip up Norf to see family. Boring as hell and not why I got the car so will remain happy with mid twenties and (occasional) teens!! 

[bacillus]

ok, if you have access to vcds could you log block 032 for your fuel trim. You don't need to start the car to log this block.

Also did you do a basic setting for the Intake Manifold Runner?

[jedi-knight83]

have you tried resetting your trip on the wiper switch, if not try resetting it at 70 mph and that should give you a more precise reading...

Note to all as far as i have been made aware this should be done after any work has been carried out on the car...

Sounds funny, but it worked for me...

hope it helps!

 

So the flap adjuster motor helped  

yes flap adjuster motor... all £149+vat of it, seems to have cured the latest running issue.

[jedi-knight83]

have you tried resetting your trip on the wiper switch, if not try resetting it at 70 mph and that should give you a more precise reading...

Note to all as far as i have been made aware this should be done after any work has been carried out on the car...

If you are resetting it on the drive, all you are doing is clearing the start of the journey where youre getting up to speed which takes a lot of fuel. Precise reading? Nope, but if you like to look at smaller numbers then yes this is a good way to fool yourself 

For only a little work (no money needed), just knock your precat out. It will gain you some mileage. Also S3 IC helped out for me, but no point in doing that just for mileage. Clean airfilter helps too.

pre cat is already out and has been back to r-tech since removing it to tweak the map for the pre cat delete.

[jedi-knight83]

To be honest... thats probably about right. I did a 2 hr journey a few nights ago. 3 people in the car and full boot. Avg. speed about the same as yours with a few booting sessions... and it did 26MPG.

this was with just me in the car and no luggage.

Just after it was mapped by r-tech it was comfortably getting 28-30mpg at those kind of speeds

[jedi-knight83]

I imagine at 80-85mph you will only see mid twenties. 60-65mph and you might see mid thirties. Have logged my petrol consumption on my ED30 since my ownership and (without looking right now) i think in the last year, on average I have achieved 27.8 mpg, albeit with my rather heavy right foot.

Usually on my 120 mile trips to Lincoln on the motorway I see between 30-33mpg at the "higher speed" but I'm frugal with the right foot.

Can I ask how many miles on the clock atm?

just about to hit 67k

Ive seen 28-32 mpg on a run at 80ish mph before but it seems to have got alot worse lately and hasnt improved after changing all these parts.