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Fuel Economy

beershark

beershark

PCGB Member
Member
My 98/R C2 Tiptronic with around 100,000 miles on the clock has up untill recently been averaging 22/25 mpg on the PCM unit on a combination or slow town, quick town and distance driving (27-30 on the motorway at restrained speeds!).

No end of problems with it after the OPC did some relatively minor work on ir with resulted in several breakdowns and work being done under warranty.

Cutting a long story short I have had new oxygen sensors replaced and a new Tiptronic gearbox (so, soooooo pleased I had the OPC warranty) and now the economy is at around 16/17mpg.

Also seems to be idling a little lumpy but drives and pulls well and smoothly.

Any thoughts?

What are other people getting and does anyone know the 'official figures'?

Thanks in advance.

Rob
 
I reset my OBC three weeks ago and since then have done 3 motorway blasts to Brum and back (100 miles each way) and daily trips stop-start across town to work (7 miles each way). Computer is reading 22.6mpg. HTH.

I would get a diagnostic check done by someone with a PST2. It would show if there are any pending problems which aren't at the point of triggering the 'check engine' light. (MAF related, for example). If you are anywhere near me get in touch as I might be able to help.
 
Hi Richard,

I might pop into my OPC on Saturday morning as I have a long trip to Manchester over the weekend.

Where are you based and thanks for your kind offer of help, what would you be able to do or advise?

Thanks,

Rob

 
Anyone else have some fuel economy figures they would care to share with me before my visit to OPC (or Richard [:)])?

Thanks in advance.
 
I average between 22 and 27 per gallon. If I drive it hard for long periods I get about 18. If I drive it at asteady 70mph for 200 miles I can get 32 mpg!

My car averaged 27 mpg on the 3000 mile Spain trip last year.

Hopr this helps.
 
Motorway driving, mainly at ~ 80 (kmh obviously officer!) odd spurts higher as/when, computer says,.........27.2mpg.

Hope it helps.
D
 
I am averaging 24mpg with short and long journeys. On a run it will return 27/8 and on just short journeys then 20
Hope this is of use
 
15.4 MPG mostly town driving, but having recently done a 200 mile trip on motorways the 3 month average has moved up to 16.1 MPG.
 
Rob

I would get this checked out as i do about 24/25 MPG unless i drive very hard.

Do you know how many miles you get out of a full tank that may help to see if it is using more fuel than other members use.

Phil
 
Guys,

Thanks forthe input.

I was getting an average of 22-25 mpg until I recently had a string of problems originating with poor quality work at an OPC.

All rectified under goodwill (as they caused the problem [&:]) and other stuff under warranty. The latest problem was oxygen sensors replaced and after that is when the MPG plummeted.

I will pop into OPC and get them to check it out on Saturday and update this thead.

Rodney, yours loks pretty low even with a heavy foot. I was getting 20+ around town in a spiritred fashion.

Thanks again!
 
C4 Cab manual (3.4)

Motorway runs averaging 80mph gives 29-32 mpg.
General knocking around (mainly short journeys) gives 25-27 mpg with "entertaining" acceleration.

Shell Optimax
 
Rodney, yours loks pretty low even with a heavy foot. I was getting 20+ around town in a spiritred fashion.
Click to expand...

[:D] After reading this thread, I tried very hard to raise my MPG for the day. During normal spirited driving around town and on dual carriageways, I was getting 13-15MPG. Driving very slowly, accelerating away from lights at a pedestrian speed I managed to get 20.6...
How does everyone get these high figures? In my Boxster I was managing 16.7 (very few motorway miles)
 
For the last year I lived in Central London. I rarely did short journeys around town, but travelled regularly out through South London and cruised the full length of the M3 and M27 to Dorset. That represented about 90% of my driving and resulted in an average of 23.1 mpg.

Now that I live in Surrey, with lots of windy bits, and a lot of short "convenience" journeys, the consumption has gone through the floor (as has my right foot obviously [:)])to something in the region of 15 mpg.

Oh, and its a Tiptronic which, as Richard mentioned, is a little more thirsty than a traditional gear bag.
 
Hi Dave,

Sorry don't know the answer as to why you're 2MPG different.

To be honest, getting anywhere above 30MPH is great.

I can only manage 16MPG!!!!! Has a lot to do with where I live (Traffic) and partly to do with me driving 'proactively' when I take it for a run in the country.

Got a long trip to Manchester in a couple of weeks, so will see if I can better your figures and get back to you. I have a C2 3.6. Should be interesting.

Just out of interest, what fuel are you using in the car?
 
Hi Dave,

I've had 34 mpg out of my C4S on a steady run.... but I average anything between 27.5 to 30 mostly although I don't do much town driving... that does include a slightly higher than national limit on motorways tho'...... but only keeping up with everyone else!

Guess I need to take the slippers off.....

hth

Paul

PS - are you at Silverstone Classic this weekend?
 
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