UPDATE:
I'm getting 50 MORE kilometers per tank with the Ractive!! This is my 4th full tank and the results are consistant!
Prior to the Ractive I was running the regular Mazda one-use and then upgraded to a K&N drop in box filter and was getting about 419 kilometer on a full tank to when the low fuel warning comes on. Now I'm getting about ~470! I know it's still not fantastic but it's a lot more than I'm use to getting. Makes me wonder if I were to buy a really good SRI if I would get even better fuel economy...
05 4speed Auto- driving in manual mode, GT Sport, 90% highway driving.