One thing to remember, the magazine apps are free but most of them require you to purchase the issues monthly or by a subscription. Some will even give you free access if you already get the print version.
There's a thread around here that lists the free magazines. Let me see if I can find it.
Here it is, but I don't see any car magazines in there. You may browse it and see if anyone has found any. If you didn't know, C&D can be subscribed to for 1.99 a month or 19.99 a year instead of paying the 4.99 per issue. You can also cancel anytime, so you can try it for a couple months and cancel if you don't want to pay for it anymore.