BOSTON — GMAC LLC and a bank lobby group are butting heads over the high interest rates GMAC's bank unit is paying for deposits, with bankers saying GMAC is unfairly subsidized by federal funds.

In the latest salvo, GMAC, the lender long affiliated with General Motors Corp. and now Chrysler LLC, said on Monday that a complaint made last week by the American Bankers Association was "highly inappropriate," and accused the lobby group of restraining competition among banks.

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