Bought my '06 Highlander a month ago. Really disappointed n the MPG. Expected to get at least 30--getting in the low 20s. I know how to drive a hybrid--was getting 39-44 with my Civic Hybrid, but it was just too small. Tye engine is also excessively noisy at acceleration--sounds like it needs a tune-up. Tried running mid-grade w/o any affect. Hoping they come out with a conversion kit similar to what folks are doing in CA that will adapt it to run primarily on nicads for about 100 miles before recharge. If enough people push them, Toyota will see the potential profit and maybe do it.