is it normal to lose mpg's

[welshdean]

I've recently put on an s2000 filter and noticed the mpg has dropped to an average of around 23 mpg around town and when I was running the standard panel filter I was getting an average of 25-25 mpg.

Would the filter lower the mpg or should I start looking where the problem lies

[mcgee9t2]

cant see how it could lower the mpg. could be wrong though

could just be you driving harder?

[welshdean]

Nothing more than usual mate. If my maf is f**ked would it be lower than this

[xxChrisxx]

What's the point of the s2000 filter?

[welshdean]

Because I'm a tart and like the sound and more so I can hear my dv 
But it's too big to even use a heatshield properly as there is too much strain on all parts involved.

Everything on my car is standard apart from the dv, so I'm guessing I don't even need an s2000 size filter at the moment but just not sure of what other choices I have to give me the induction kit roar and the tshh from the dv

[xxChrisxx]

As shocking as it may seem, you probably are flowing slightly more air for a given throttle position. Therefore burning the extra fuel. Probably doesn't account for all the loss of economy though, as 10% is a fair bit.

Running without a heat shield is probably not the best idea. It's unlikely to make anything go pop, but nice chilly air is the ticket

There is one sure fire way to find out, stick a proper filter back on it and see what happens.

[GTi_James]

As shocking as it may seem, you probably are flowing slightly more air for a given throttle position. Therefore burning the extra fuel. Probably doesn't account for all the loss of economy though, as 10% is a fair bit.

Running without a heat shield is probably not the best idea. It's unlikely to make anything go pop, but nice chilly air is the ticket

There is one sure fire way to find out, stick a proper filter back on it and see what happens.

+1 you have to be prepared for loss in fuel if you're adding bigger suckers on mate, more air+morespeed=morefuel 

[navmk4gti]

Your booting it more wanting to hear the noise...hence more mpg

[welshdean]

Noise ? What noise?..... It's sh!t 

I've taken the heatshield off now anyway as it wouldn't sit properly onto the maf. So knowing my luck it will run like a bag of sh!te lol

[navmk4gti]

Did you not just make the hole bigger for the heat shield .. you need to be a diy bodger with mk4s