STAMFORD, Conn. -

It seems the impending fall market may have already begun affecting prices in the lanes as summer was wrapping up.

According to the latest RVI Market Updata report, the RVI Used Vehicle Price Index fell by 1.6 percent in August when compared to July. Year-over-year, the index fell by 2.6 percent last month.

And the nominal index saw a decline of 1.6 percent from July levels and fell 0.3 percent from August 2013.

Price declines last month were expected to be heavy, as NADA issued a report in Mid-August which stated auction prices had already fell by 3 percent, exceeding industry expectations.

According to the latest report from RVI, sports cars and minivans were the only segments to buck the trend last month and post auction increases.

Sport cars saw a 1.2-percent increase from July, but were down 3 percent year-over-year, according to the RVI Used Vehicle Price Index. And minivans saw a spike of 0.4 percent from July and was up 0.5 percent year-over-year.

On the other hand, the smaller vehicles, such as small sedans, compacts and sub-compacts, saw prices drop the most this past month.

This may not come as much of a surprise as gas prices fell to $3.57 in August, down 12 cents from July — a trend which is normally connected to lessening interest in the more fuel-efficient segments.

Prices for small sedans fell by 2 percent from July and were down 6 percent year-over-year. Compacts fell by 2.1 percent and notched a 4.3 percent decline from the same period of 2013. Lastly, the sub-compacts saw prices drop by 2.6 percent from July and 5.4 percent from August 2013.

Posting the largest monthly price drop was the luxury full-size sedan segment with a price decline of 3.4 percent from July.

High-end units have been seeing some of the largest price slides for close to two months now.

And as we ease into fall, prices are falling at an ever quicker pace. According to a post on NADA's Used Car & Truck Blog, used -ehicle prices are down 3.4 percent already this month.

“September price movement at the segment level has more or less followed the same pattern observed over the past few month’s where the biggest losses have been recorded in segments where new market competition and used supply growth has been most significant,” David Paris, automotive analyst at NADA said in the blog post. “Subcompact, compact and midsize car segments continue to perform rather poorly, with prices down by between 3.2-3.6 percent for the month.”

Large SUVs are also taking a particularly large hit this month, and are down by 4.3 percent so far.

“While the month’s loss seems like a lot right now, it’s important to remember that this is an extremely low volume segment and substantial prices swings at the individual model level can significantly affect the overall representation of prices for the group,” Paris said.