After winning the TZ250 Challenge last night (in 1:47) I decided to run the TZ250 Championship and did a photoshoot at Suzuka West with the reward bike : YSP & Presto Yamaha.
I use the "save for web" feature in PS and then set the quality to medium. That would be the most likely culprit. File size is typically in the low 20 kb range. It could be me oversaturating a bit as well making it look a little low quality.
Perhaps tonight I'll save at the higher level and see if there is a difference (there should be). If not, then I'll tone down the saturation=)