(sorry if this has been asked before)

Looking to Bluefin my ST170 to hopefully increase the MPG.

Has anyone already done this? Do you have MPG before and after?

Just looking to see if it's actually worth it and work out how long it would take to pay for itself.

At the moment i'm getting 29MPG with a standard ST170.

Not really bothered about BHP increase as it's not a lot.

Bluefins are currently £199 for ST170.

Thanks All