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Does it seem like the engine is working normally, but the car itself is dragging? Couple of thoughts.
Could be the cat, but the increased back pressure from a clogged cat will usually be worse at higher RPMs.
Check your RPMS at MPH - there are several online calculators that will tell you what the RPM should be at certain speeds. If the RPMs are too high, you may have some trans/troque converter slippage issues.
When was the last time your brakes were done? Any chance a rear caliper is hanging up a bit? A front caliper hangup will usually show up with a pull to that side - not so much with a rear. Any chance the parking brake is hanging?
How about wheel bearings? Could need repacking.
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