Raven wrote:and pitiful torque for it's size.
235 ft/lbs from 4.0L is "pitiful"? You can't look at a peak number...you have to look at the curve. That number was FAR left (peak tq was at 3200rpm). You could easily let out the clutch in gear and the Jeep would start creeping....no throttle necessary and it wouldn't stall. How many non-pitiful motors could do that? Very few.
Emissions and crash regs killed it (V6 offers more crumple zone....same reason Mercedes changed). It was an OLD design. Anybody who lived with one knew it was thirsy but didn't complain about it's performance. My JK is faster but the TJ *felt* faster and that's all about torque.
the TJ got 16/19 EPA mileage. The JK now gets 17/21 with the Pentastar. The 3.8L in the '07-11 JK got 15/18 or LESS than the TJ with the 4.0L. Chalk that up to a curb weight difference.
Ignoring the Pentastar for a minute...the 3.8L got 205hp and 240 ft/lbs compared to the 4.0L's 190hp and 235 ft/lbs. Difference being the 3.8L needed more revs for both (i.e. moving away from a "truck" motor).