Yeah , exactly rite guys.- differing circumstances require different solutions an dits good to keep that in mind when recomending mods etc. to others.
I am up for 2 sets of new tyres (we swap to studded in winter time) so in the next few weeks ime off to the tyre store to try and strike a good deal.
In my investigations of high milage tyres it seems that most are offering up to the 5% improvement mark.
With my handy calculator I was running the numbers through it comparing the gas cost savings (my gas is 1.90USD per Litre) and the cost of the tyres themsleves over the cost of standard tyres.
It was close , but it worked out that it would take 5 years for me to justify the cost of the FE tyres.
Because the tyres are only on for 8 months of the year perhaps I could get 5 years from a set before they wore out - But it is likely that I would sell the car within that time.
So for me , this FE mod is bad $ economy.