Okay, so I drive a pansy truck (2003 Explorer Sport Trac). I've owned it for a little over 2 years now and it only has 30,XXX miles on it. It only had about 7K when I bought it. Any way... The other day I was drivin' and coming from the fact that I live in Houston, we have A LOT of a-hole drivers. Well, someone sped up to try to keep me from getting on the entrance ramp, so I floored it. Smooth into second (this was from a stop merging onto the feeder road), get into high second, then the gears f'n grind like hell into third. Now, I have a really strong third gear, so it was really noticable. I thought that it might've just been a weird slip and so I just shrugged it off. Well, the other day I decided to floor it not once, but twice, and it did the same thing. Should I have it looked at? I've done it again and it doesn't always do it, but has about 3/5 times. Also, these things are supposed to get 17mpg rural and 21mpg highway. Well, I'm getting an average of 16mpg and I drive almost ALL highway. Any idea what could be up? I know that those numbers are under perfect conditions, but I used to get a lot better gas mileage than that. It's not the ethanol. It's not my air filter (brand new). Any ideas? Thanks .