The 1256TG and the 1257TG are both standard voltage servos. Even with a LiFe you will need to run either an adjustable BEC or a regulator to make sure you don't exceed the 6.0V max. I actually would suggest the 1256TG for steering in 1/8th scale, and the 1258TG throttle/brake. The 1258 is still real fast but offers more torque than the 1257TG. That's my $0.02.