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Welcome to the site, davyboy.
First question (you had to know it's coming): do you need a Yukon?
If not, the best vehicle mod you can make is to look around and find something different that actually gets decent fuel economy!
If you need to drive a big truck, there are lots of changes you can make to your driving style & the vehicle, but the end result is you'll still be going through a lot of fuel.
Personally, I'd would have been leery of getting a thirsty vehicle knowing what's going to happen to fuel prices once the economy claws its way out of recession.
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