Just bought a 2012 Prius 2, help! Unusual fan and accelerator?

So on January 28, 2013 I purchased for myself a 2012 Prius 2. I am worried about some things I have been experiencing:

1. When I get to speeds of 65+ the accelerator seems to vibrate a little, but it doesnt feel like violent shaking. I had dealership look to see if the tires need to be rotated and they said it seemed "fine." Why is the accelerator feeling vibrational at higher speeds?
2. It is winter here in New York, and I keep the heat temp and fan on low or 68(F), but when I drive the fan randomly turns up to high?
3. How can I digitally check on the system indicators my current oil health?

Any tips or information about the random turning up of my fan and vibrating accelerator at higher speeds would be great. I don't want to break my new car!

 

I am not sure if it is normal feeback, but for instance, on my last car which was petrol only, when I would accelerate faster it wouldn't do that to me. When it starts using more near and into the power part it makes the slight noise of vibration and I can feel it. It feels like it is under the accelerator or under the car under the part where the accelerator is. I had the dealership check because I was worried that the tires might need to be rotated, but they told me there was nothing wrong. Am I being lied to? How can I check what is wrong? Should I keep driving? And how am I supposed to know when to get an oil change then?

 

^ That is what I was wondering, if it is normal in the Prius or not. I brought it to the dealership a week or so ago and it was snowy out, they said it was probably just snow in the wheel wells? They said they balanced them and it should be "fine" now. But, the past few days here have been very mild, even some rain, no snow for sure, and the car still does it (the vibrations) in the 60mph + area. The wheel doesnt jerk or do anything violent, but it does vibrate up to the wheel. What could be the issue if the dealership has claimed to have balanced the tires?

 

There is not another Toyota dealer for some distance, or at least one that I know is credible. I think I will go back and tell them I am NOT leaving until the issue is resolved, and I will use the Lemon Law if I really have to. I am extremely annoyed that I bought this new car and they have not resolved what seems to me to be such a simple issue. I gave it time, and I waited for the snow to melt away. There was no ice or snow in the wheel wells when I was driving 60+ mph, so I am very skeptical. All I know is they legally have to fix this issue as I have had it since I bought the car.

 

I have considered going somewhere else but I am not sure to whom? I was thinking Valvoline, they have always been very honest and straight-forward with me, never had any problems with them. But I am not sure if this is their expertise. I just refuse to leave the dealership again until I am 100% sure that my car is not vibrating up to the wheel.