you can't actually make the claim that 25k is too long with any authority simply because the only way to know if a filter is restricted is to measure the restriction..It doesn’t matter where he buys fuel, 25K miles is too long for the fuel filters.
the fact the filters are probably restricted doesn't mean fuel filters cant go farther than 15k, 25k 35k.
That end result has more to do with the quality of fuel used and the amount consumed and filtered.