Gas prices in McHenry, as with gas prices across the country, have spiked over the course of the last year. And higher gas prices are a leading cause for the increases in prices for almost everything else. It’s called inflation but you can fight back – tune up your car, truck or SUV to save.In January of 2021, the price of gasoline in the Chicago area was approximately $2.60. It is now around $3.75.