Help am only getting 30.4 mpg out of my ford fiesta 1.6zetec s it does have k&n filter but shouldn't make that much difference it only standard filter. I've herd some one is getting 60 mpg from same car. HELP PLEASE !!!!!

 

I would say high 30s is where they should be, but they can drink petrol and cone filters dont help thats for sure

 

OP, Are you the owner of lead feet?

Cone filters if driven as you would an air box in theory should be more efficient. Cleaner colder volume of air creating a purer combustion along with a good regular service.

But with the sound and slight increase in power it's unlikely to be driven steadily by the average person.

Plus more Eco friendly than paper filters and last years so cheaper too. I've done plenty of research owning a filter company a few years back

 

Ford claim 40+ MPG in the heavier Focus! Given that these claims are never seen in the real world.

But it depends on your driving style and the conditions, i.e. if you are doing town driving this will equate to a considerable decrease in performance.

Martin

 

That is not quite true, in some cases fitting a filter can make an engine run worse, if affected by heat soak, for example. Imo a decent panel filter is better than a cone and that the latter just create noise.

In the case and others the OE filter has a 'snorkel' fitted, so cool air is induced.

Martin

 

Very true. Fitting a heat shield can offer minimal protection. Cold air feeds are petty essential to a cramped engine bay where a filter is susceptible to heat. Other options are arguable like stainless filters will keep cooler than a foam or cotton but this offers less filtration than the other two.

And I have to agree on a decent panel filter in an air box can provide better gains than a heat soaked filter