I have a 2006 4WD EX 5-speed manual. I bought it from a dealer, and I have two weeks left on the warranty. I can't shake the feeling something is wrong with the engine. The car needs to shift up VERY quickly, which I'm not too annoyed by, but when I get into 5th gear, the car hits 3000rpm by 60mph, and goes up by about 250rpm every 5mph increase. On the highway, I'll be at a steady 3500rpm going 70mph, and the engine sounds like it is running really hard. My dealer says that some transmissions are just built this way, but it feels pretty unnatural. I've never had a manual 4WD car; can anyone tell me if this is just a normal characteristic of a manual car using 4WD? or does it sound like there is something weird happening? It also seems like my gas is really going quicker than I'd expected, but that might be because I had a small Tacoma and a Honda Accord before this and I'm just not used to the gas usage of a 4wd.