I owned 2.7 4wd Toyotas for over 10 years, a 95.5 and 97 Tacoma then an 00 Runner. I always managed around 20-24 MPG and was always pleased with the power. I never had any trouble getting into traffic, and here in MA that is saying something. The 2.7 is a great motor, as far as longevity both the 2.7 and 3.4 seem able to reach really high mileage. The 2.7 is definitely easier to work on, and it requires less maintenance overall, timing chain vs. timing belt for example. Manual to manual w/ similar gearing the 3.4 will seem more powerful than the 2.7, but that is usually not the way they are, the 2.7 comes with lower gearing, which helps it build RPM's and gets into the power band. If you take a 5 speed 2.7 with 4.56 gearing and a auto 3.4 w/ the common 3.90 gearing acceleration times will be very close, but you will have to push the 4 harder. I now have an 02 Runner w/ the 3.4 and auto and it is nice, but it pretty much struggles all the same places as the 00 Runner did and gets 16-18 MPG pretty much all the time. I went to VT and expected better mileage, but all the hills and constantly downshifting and unlocking the T/C pretty much put me at about 19, the 2.7 got about 22 on the same trip.