September CPI rose 3.7% and the driver was energy. Patrick De Haan of GasBuddy says the average diesel price is likely to break its all-time record in October, which matters because diesel feeds freig

What happened: Inflation rose in September to 3.7%, according to the latest Consumer Price Index, three weeks before the midterm elections. The increase is largely driven by energy costs. Key numbers: September inflation 3.7% per the Consumer Price Index. Why it matters: Patrick De Haan, head of petroleum analysis at GasBuddy, said the average diesel price is likely to break its all-time record in October.

Inflation rose in September to 3.7%, according to the latest Consumer Price Index, three weeks before the midterm elections. The increase is largely driven by energy costs.

Patrick De Haan, head of petroleum analysis at GasBuddy, said the average diesel price is likely to break its all-time record in October.