If Monday is your fill up the tank day officials at GasBuddy say you're saving money. They say Monday is the best day to save money on the gas you're pumping into your tank. GasBuddy officials say average gasoline prices in Yakima are up 5.2 cents per gallon in the last week, averaging $4.55 per gallon Monday, according to GasBuddy's survey of 91 stations in Yakima. GasBuddy official say prices in Yakima are 1.8 cents per gallon higher than a month ago and stand $1.21 per gallon higher than a year ago. Every week the cheapest gas is always in the lower Yakima Valley. In fact the cheapest station in the Valley, in Wapato is priced at $4.01 per gallon. The lowest price in the state yesterday was $4.01 per gallon while the highest was $5.79 per gallon, a difference of $1.78 per gallon. Summer prices are expected to rise even more in the coming months.

GasBuddy officials say the national average price of gasoline is up 6.9 cents per gallon in the last week, averaging $4.17 per gallon today. The national average is down 1 cent per gallon from a month ago and stands $1.29 per gallon higher than a year ago, according to GasBuddy data compiled from more than 11 million weekly price reports covering over 150,000 gas stations across the country. But it's not gas that's getting the attention, it's diesel.

“Gasoline prices have continued their rally in the last week with oil prices sustaining higher levels, but the real story has been diesel fuel, which has skyrocketed to its highest level ever seen. Diesel is now $1 per gallon or more in many areas compared to gasoline," says Patrick De Haan, head of petroleum analysis at GasBuddy. "The meteoric rise in diesel prices is likely to continue for the first half of the week at least, while gasoline prices could continue to see a slow but steady rise. For now, the rising cost of diesel will surely be felt in the grocery store, hardware store or on your next flight as jet fuel prices accelerate, leading to a continued rise in inflation likely to ripple across the economy."

Historical gasoline prices in Yakima and the national average going back ten years: May 2, 2021: $3.34/g (U.S. Average: $2.89/g) May 2, 2020: $2.28/g (U.S. Average: $1.76/g) May 2, 2019: $3.41/g (U.S. Average: $2.90/g) May 2, 2018: $3.13/g (U.S. Average: $2.82/g) May 2, 2017: $2.87/g (U.S. Average: $2.37/g) May 2, 2016: $2.34/g (U.S. Average: $2.22/g) May 2, 2015: $2.70/g (U.S. Average: $2.61/g) May 2, 2014: $3.80/g (U.S. Average: $3.68/g) May 2, 2013: $3.55/g (U.S. Average: $3.53/g) May 2, 2012: $4.03/g (U.S. Average: $3.80/g)

Neighboring areas and their current gas prices: Tacoma- $4.69/g, up 3.2 cents per gallon from last week's $4.66/g. Seattle- $4.83/g, up 1.3 cents per gallon from last week's $4.82/g. Washington- $4.67/g, up 1.5 cents per gallon from last week's $4.65/g.