lsd diff
lsd diff
the diff won't make that much of a difference to your MPG. If you are concerned about petrol costs, you bought the wrong car.
Why advise someone to get a welded diff when it's used for the road as well? A good LSD is still better than a welder.
lsd lets the wheels spin slightly independently from each other which helps grip while cornering so turning left for example will cause the right side wheel to spin faster then the left side as its got more traveling to do, for drifting its usually the norm to lock the diff so both wheels then spin at the same rate of speed and equal amounts of spin on each wheel, rather than one trying to out grip the other