Consumers became more jittery about the economy in June as the Bloomberg Consumer Comfort Index fell to minus 37.9, down from a four-week high of negative 36.4

While both readings are in the negative range, suggesting a generally pessimistic outlook about the American economy, the latest drop comes at a time when gas prices are on the decline, analysts with Econoday said.

In fact, Bloomberg, which compiled the report, said in the most recent survey, there were fewer Americans who thought the economy was improving in June.

Econoday noted that all three indicators evaluated in the study declined. Its index score on the state of the national economy fell from negative 65.7 to negative 69.8

The personal finance gauge fell from minus 2 to -2.3, while the index score measuring consumer sentiment about whether today is a good time to buy remained in the negative 41 index score range.

The Bloomberg Consumer Comfort Index is a weekly, random survey that asks Americans about their views on the national economy and personal finance.