Your really should consider shooting shots like this with a large aperture... to soften and blur that ugly background. A little editing in post can go a long way too! This took me less than a minute (Normally I would NEVER use photoshop Blur on a background.. but this is to sort of show you what could have done!)
If you are shooting a car.. make the CAR the subject.. and kill any and all distractions if you can!