I don't think so. I search in Google everyday from the same office computer. Fonts, however, been different and I relate it to the situation with Google's stock. When Google's projected earnings go poorly, they push their online ads onto visitors by making them look bigger than regular results. When company does well, then ads also look normal. That's why you can't notice any changes now

Perhaps, high oil prices also have some impact on Google's ads

At least short term impact.