While grocery prices are starting to drop and other parts of the economy show signs of improvement, gas prices in Washington state are steadily climbing. The hike in gas prices follows a 7.6-cent increase recorded last week. Get our free mobile appSO WHERE DO YOU FIND THE CHEAPEST GAS? A short drive to the cheapest gas in Yakima at the Athtanum Fuel Stop/Sinclair on Goodman Road selling gasoline at $3.60 per gallon. Price declines are being seen in states like Ohio, Florida, and Michigan, while Indiana and Washington state experienced a large weekly increase.