More than a quarter of the 4 million-plus households that own a GM MasterCard are more likely to buy a General Motors car or truck because they have the cobranded card, a consumer survey indicates.

Based on its survey of 6,000 households, Brittain Associates Inc. also extrapolates that half a million households which were planning to buy a GM vehicle intend to do so sooner. Of those surveyed in April, 263 households said they carried one or more GM MasterCards from Household Bank.

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