[V6-12v] fast tire wear

[Sean Coriaty]

Front tires on a '93 100csq sedan w/ auto trans are wearing rapidly on
edges- inside and outside.  Stock wheels and tire size, alignment is good.
This is the 2nd set- almost history in less than 8k miles and 6-7 months.
Rears (mounted same times as fronts) look new.  Most driving is on rural
curving country roads w/ 35-45 limit but driver takes them faster.  Some
noise is heard around turns (tires don't squeal, but do moan).  Car doesn't
feel out of control or even near limit.  A '91 200 20v avant can take the
same roads, faster, without such wear.  Any input to slow or stop the wear
other than "slow down"?  Thanks.
Sean in NH