Have bike, will travel
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,284
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
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Everything thing else being the same, no, 28mm is not going to be much of a speed increase.
If you select a faster tire, like the 700c28 Vittoria Corsa, you will get less weight and lower rolling resistance along with slightly improved aerodynamic performance. The combined benefits you will notice. However, I wouldn't use this type of tire on gravel.
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.