AS researchers who test the accuracy of odometers know, your mileage may vary, and when it comes to a car’s warranty, that could cost an owner money. An odometer that piles up mileage faster than it should will push a car out of warranty quicker than an odometer that is calibrated correctly.

That is what was happening to many Hondas and Acuras until the problem was noticed by a lawyer in Arkansas, who, along with several other lawyers, filed a lawsuit against Honda in 2004. A final settlement was approved last December, but the deadline for owners to file a claim is approaching: June 26.

Now, the lawyers who sued Honda are going after Nissan, claiming that odometers in 2004 and newer Nissans and Infinitis are running fast. Steve Parrett, a spokesman with Nissan North America, said the lawsuit was without merit.

“These lawsuits are based on nothing more than the variation inherent with any form of measurement,” he said.