Verified answer

In 2008 the main difference was no floor mats standard in an LS the Ls does not have remote start as standard and optional power seat. All of those things were standard on the LT.

2008 Chevy Impala Ls

The LT gets leather seats.

LT has a few more options and a higher price tag.

If you don't drive foot to floor all the time not really, I believe its only 2-3 mpg diff