I changed the tyres on my V70 D5 from 225/45 17 to 225/50 17 to get slight improvement on fuel consumption and lower revs at motorway speed which is where it spends most of its time , I dont care about the small loss of acceleration and would judge the speedo to now be indicating slightly under the true speed , would have been better to have a 6 speed box in the first place but not available in 2003 . The only downside is rubbing the wheel arch plates on full lock which contrary to 'advice' I was given 25k miles ago have not worn holes through them (just worn off the paint) and it passed its mot. I am just wondering if I could change to yet another higher profile tyre to get a further improvement in mpg . I have done 125k miles in four years so am always looking to reduce fuel consumption.
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