wider volume tyres will have the better rolling resistance at the same pressure as narrower tyres , it gets very techy but i reckon you would feel a difference buy swapping to a wider rim as it will change the profile of your tyre and if your everyday riding involves a lot of skidding round corners - it's bound be a touch different?
saw sometting else about this last night that got me thinking even more...
http://www.schwalbetires.com/tech_info/rolling_resistance
wider volume tyres will have the better rolling resistance at the same pressure as narrower tyres , it gets very techy but i reckon you would feel a difference buy swapping to a wider rim as it will change the profile of your tyre and if your everyday riding involves a lot of skidding round corners - it's bound be a touch different?