Not really the type of vehicle where a high top speed really matters, but I'm gonna guess somehwere in the neighborhood of 115-120 for the 4cyl and a little higher for the V6. Of course I don't know if there is a speed limiter involved, but if there is then the top speed is likely the same for both engines.
H rated tires are good for 130 mph. If the vehicle can exceed that speed the computer will limit it to 130 or slightly less.
I don't know what the top speed is on a V6 but probabably around that 130 mark.
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