Prices at two of Guam’s gas stations rose above $4 per gallon for regular unleaded Monday afternoon, and the third gas retailer matched those prices by Tuesday morning.
Prices at Mobil and 76 gas stations rose to $4.03 per gallon for regular unleaded by Monday afternoon. Prices at Shell gas stations remained unchanged until late Monday or early Tuesday.
The last increase was on Jan. 1, 2018, to $3.88 per gallon.
Source: Google News : http://www.guampdn.com/story/money/2018/01/08/gas-prices-jump-15-cents-mobil-guam-76/1012094001/