The US dollar pushed higher on Friday and the yen sagged as the finance chiefs of the G7 began meeting outside London on global economic challenges. The Euro dropped back below the 1.30 dollar line while the dollar almost touched 102 yen. The dollar traded at 101.62 yen, compared to 100.55 yen a day earlier. The Group of Seven top economies opened fresh talks on spurring growth on Friday amid US-Europe divisions over the scale of austerity and renewed market focus on currency wars after the yen hit new dollar lows.