Shoud I need/use energy gels

I do a 3hour ride on a Saturday and find the last 6/7 miles a bit of a struggle.I drink 2x500ml bottles of Hi5 4:1.Its not a particularly hilly circuit and is only 50 miles.As the subject says should i be using gels to supplement the bottles.Thanks for your help.
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As the numerous posts I expect to follow will show however, there's more than one way to skin a cat. Hence options other than gels may make for an alternative. I've used bananas, flapjacks, energy bars, Fry's Turkish Delight's, various types of gel etc but simple Lucozade Orange gel is my favourite and at 65p a go in Tesco's, hardly breaking the bank.
The simple answer is, next time you go for a 50 miler, take a couple of gels and aim to take one around 2 hrs in (it's not quite an instant 'hit' if you get my meaning, so basically 'aim-off') and another half an hour later. If it works for you, problem solved.
2 x 500ml of High5 4:1 is, what , about 90g in total, so you are taking in a third of what you should/could, so it's not that surprising that you tailed off towards the end.
Now, clearly with shortish rides (<2 hours) you will simply use the stored energy in your muscles. But above that I'd say good fuelling is essential to maintaining your performance.
Bars, gels, flapjacks, chews, whatever you fancy. What you take is not so important. Solids go in slower IME but not by a huge amount.
Just stick a pair of bananas in back pocket and eat thos after one hour, then two.
http://www.youtube.com/watch?v=aK5Bfqj5fxY
Like it was said earlier you can take in a lot more than you are taking in at the moment and it will help your energy levels
it's a hard life if you don't weaken.