&gt;He told me that 2015 cars were pretty much unaffected and will likely only get a firmware tweak<p>And what exactly will this firmware tweak do?  If it decreases performance or fuel economy, then that isn&#x27;t acceptable.  The customer bought the car because it advertised X horsepower and Y mpg; if the firmware tweak changes that, then that&#x27;s false advertising and the company needs to refund their money in full.