Why am I getting terrible MPG in my 2010 Ford Fusion?

Why am I getting terrible MPG in my 2010 Ford Fusion? - 1

Added (1). I have a 2010 Ford Fusion with the 2.5 i4 and after every fill up it says that i averaged like 18-20 mpg. How is this possible when the average MPG for the 2010 fusion is like 26MPG. Can somebody help me figure this out please!

Does misaligned serpentine belt cause it to slip off?

I have a 2007 ford fusion 2.3L with 90, xxx miles. About a year and a half ago I had the belt changed because I had a leaky axle that was slinging greass all over it causing it to squeak and it's was the original belt so I guess it was time for a new one anyway. Everything was fine up until about 6 months ago, I had a idler pulley that was in bad shape causing excessive noise replaced by a friend that works on cars and we just reused the same belt since it's fairly new. All was fine until a month or so later I began to get another squeak and I had no idea what is, not bad just on start up but after awhile of driving it goes away, I read online I may just be a misaligned belt so Ignored it for the past 4 months and this morning I get into my car start it and a hear a wword noise immediately after I turned the key and my battery light came on and lose of power steering, pop the hood and belt is off all the pulleys. Strange how traveling over 70+MPhil daily going 100 miles away for months nothing happens and simple start up takes the belt off. Any ideas on if I should get a new belt? Or does tightening pulleys make a difference? Does misaligned serpentine belt cause it to slip off - 1

What should I get for my next car? Reliable and fuel efficiently?

Right now, I own a 2008 Honda Accord but I'm planning to trade it in and buy a new car.
Many options these days. And I have no idea what I can trust.
I love my Honda Accord, I wouldn't mind getting another one but if there's another brand out there that is similar with reliability that'd be great!

what are your thoughts on Ford fusion, Kia Optima, Subaru, Toyota, an Nissan altma?

I need something that has low maintenance car since I'm not a mechanic and affordability when it comes to fixing the car.

I also need something that has great fuel efficiency.

What is the best economical thing to do in this situation?

I bought a 2008 used Toyota Camry Hybrid.

It had a hundred and thirty thousand miles on it so I got the extended warranty.

I'm thinking when the warranty runs out I'm definitely going to sell it or trade it.

There are a lot of gasoline engines that get comparable gas mileage to the 2008 Toyota Camry Hybrid so now I'm looking at them.

I'm now looking at a 2013 Ford Fusion.

The dealer offered me a substantial amount for my car.

Based on what I have invested into the car, not including taxes, it cost me about 230 a month to drive.

Since I Drive a lot, I have a feeling I will get a lot last after two years when I plan to sell it.

I think if I get out now, I can save myself a lot of money in the long run even though I lost out on a little bit.

Diffusion has only 50,000 miles on it which is less than half of mine now.

The hybrid car is great, but I don't feel like playing Russian roulette with the hybrid battery pack which could go bad at any time a $5,000 expense

2013 Ford Fusion vs Subaru Outback: Which is better on snow and more reliable?

2013 Ford Fusion Titanium AWD vs 2011 Subaru Outback 2.5i Limited AWD

Which is better for a 19 year old and can handle the intense Michigan winters? Both are fully loaded and have a little over 100k miles on them. Here are my top priorities, in order:

1. Reliability
2. Good on snow and ice (especially ice)
3. Low cost of ownership
4. Easy to drive for a new, young driver

Added (1). .Anyone wanna help me out?