If you want to lower your fuel consumption and you live in a really sunny place solar cooking is the new fad.
Solar cookers are easy to build. Apparently even a few pieces of cardboard from an old box and some tin foil will do. Give it a try when summer comes (as an alternative to -or combined with- your BBQ)!
Retail solar cookers are available as well (bottom picture).
Of course you need to have all your cooking done before sundown.