How can i do next?? do i need change gear ratio??

[jinnee4u]

I have 03 jeep liberty 3.7 4X4 .....
.........first... i do....2.5inch lift up , jeepinbyal
second...1.25inch Spidertrax spacer
and then...Cold air intake, K&N
next..Magnaflow Cat back system
next..265/75/16 Tire, Fierce attitude MT
next...Power slot Break Rotor
and sometimes towing minicaravan about 1700lb....
Finally, my biggest problem is ....fuel economy is getting worse continually.

Please advise anything to needs for my liberty...^^;;

do i need change gear ratio?? (now gear ratio 3.73, stock)

 

[Marlon_JB2]

Yup. You need at least 4.10s.