Time to say some results of my tire swap. Now my rpm:s are 1940 @60 mph and my speedo is off by 10%. I can definedly see some improvement in my consumpion, specially in motorway speeds. I am now getting same or little consumption figures as in winter with higher summer speed limits...
I bought also smaller 13" tires to the back because those big 14" were little too big. And I dont get the same gain from the rear tires as I get from the front.
14" 175/80/R14 Toyo 350 with steel wheels weighted with hubcap 16,8 kg per piece
13 165/70/R13 Toyo 350 with aluminium wheel weigths only 11,6 kg
That is huge difference I i will chance my front 14" steel wheels for lighter steelies soon