hi mate, I know you've mentioned that your brakes are ok, but I had the same on my diesel ZT and it was due to a sticky rear caliper. It wasn't completely seized, it just wasn't releasing completely so was slightly applied at all times and every now and again it would fully release. Could feel it dragging the car's speed and power down and after some time it would cause a slight vibration too.
After a long journey the brake disc and even the wheel would give off quite a bit of heat, and you could smell burning from the brake, which made it clear it was a sticky caliper.
On short journeys it wasn't too obvious that the caliper was sticking, was more noticeable once the brake + disc got hot. It never caused the car to pull to one side either.
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