Personally I would not bother unless I had a feeling something wasn't quite right with the way the car drove or there was evidence of uneven tyre wear. I cannot see why the fuel economy would improve unless there was a problem to start with.

Standard story is best-tyres-ont-back, so if following that you need to move your backs to the front first.

But perhaps thats what you meant.

Like most people I want to maximise mpg. Need to get 2 new front tyres. There is no evidence of uneven wear or signs when steering.

Is it worthwhile to get 4 wheel alignment ? Will it improve mpg ? With a ten year old car could it damage anything involved with the wheels ?

Tracking and wheel alignment are not an expensive job, but are unlikely to affect mpg unless something is seriously amiss - which it doesn't appear to be. Probably fitting two new tyres would make more difference, possibly even worsening mpg marginally as the rubber will be softer.

However correcting any small tracking errors can only be a good idea and might improve the driving experience.