LS or B16 Trans - how big of a difference

[MATTXR250R]

I have an LS in my 93 EG with a GSR tranny and I love it. I turn 4,000RPMs at 80 and I still average between 32 1/4 and 32 1/2 MPG. Plus the engine is ready to go at about all times...running 70 or so on the freeway..no need to downshift to 4th..just give it the throttle and stay in 5th.