Take heart with the popularity of the H3 there will soon be some performance enhancements that might help you wring out another 1-2 mile to the gallon.
Synthetic Oil is always a must.
An aftermakert air intake of at least a KN air filter will help a little.
I'm sure a high flow (quite) muffler will be available soon.
Lastly (I don't know why) the H3 has an engine driven cooling fan. This is 1960's technology and causes a huge drag on the engine. Hopefully someone will build an aftermarket electric cooling fan and an underdrive pully this should free up about 15-20 hp and make a difference in acceleration and gas milage.
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