With underinflated tires eating up gas, where is the TWEEL?

With underinflated tires eating up gas, where is the TWEEL?:

"Gas prices don’t seem to be going down anytime soon and ways to save are becoming the topic of discussion at the water cooler and blogs everywhere. WChecking for low tire pressurehen reading about hypermiling and other extreme methods, tire pressure always seems to make it in the mix. Tire pressure is consistently one of the most ignored maintenance routines driver’s pay attention to."