Whats happened to my MPG

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Steve Ashworth

Active Member
Posts
419
Last month or two my mpg has dropped from about 12.8 down to average of 9.5. Quite a significant drop... Its very hilly where I live hence low mpg.

Even on motorway its dropped from 20 down to 16.

What can cause this?

In last 6 months I've had new crank sensor, plugs, leads, maf sensor...

No misfiring according to faultmate..

Where do I start looking?

Cheers,
Steve
 
Last month or two my mpg has dropped from about 12.8 down to average of 9.5. Quite a significant drop... Its very hilly where I live hence low mpg.

Even on motorway its dropped from 20 down to 16.

What can cause this?

In last 6 months I've had new crank sensor, plugs, leads, maf sensor...

No misfiring according to faultmate..

Where do I start looking?

Cheers,
Steve

Air filter. Take it out for a couple of days and see if mileage goes up.
 
After I changed MAF, plugs n leads I reset adaptive values if thats what you mean?

What readings should I get from O2 sensors..

Cheers
 
Make sure air filter seated properly, if it's an aftermarket jobby fooook it off and get OEM - more to buy but wont drop your economy/power!
 
Does anyone understand the O2 readings that show on diagnostics.

Live data sample attached...

cheers
 

Attachments

  • o2.txt
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I'm really sorry and i know i will get all sorts of greif about saying this but....it';s JET FUEL!!!

i have done extensive trials with filling from different garages and the worsed is jet! i get 12mpg from jet and 22from shell sorry, i know everyone will say there is no difference but try it for yourself. go fill up at shell and see if your MPG returns...i'll bet it does!
 
In that case my next fill will be BP, its just that I pass the Jet station.

PS it wont take long to need a refill!!!!!!!!
 
Got a very good chance; Jet, just like super-markets, spot-buy fuel that is very near use/sell by date, hence keeping prices lower than BP, Shell etc. Furthermore, their own refined fuel is only filtrated 2 -3 times, as opposed to Shell (5x) Bp (4x). This makes the petrol "cleaner", removing particulates that "dirty" the fuel and lessen it's efficiency.

Shop around, try different local fuel-stops, all vehicles run better/faster/more eonomical on different fuels. Personally, I run all my bikes on Tesco Momentum (higher Ron and more mpg), the Range is better on BP fuel, but lower mpg on morrisons or tesco standard unleaded!
 
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