Originally Posted by
Cycbk99
Thanks for the recommendations, and I'm definetly more "recreational" pace!... it's just I seem to have to pedal harder to keep up with others on gravel/hybrid bikes when cycling on cycle paths with harder surfaces like compact gravel or tarmac. So I thought maybe changing the tyres to less knobbly ones might help... or else I go build bigger leg muscles!!

What pressures are you running? Lots of good recommendations here but I would run the maximum pressure on pavement and lower it when riding in the dirt.
My mtb feels like a slug on the road but raising the pressure helps.