sorry to hear about the fire.
Here's a very long read on how to improve MPG with over two dozen suggestions.
Everything in the FAQ below are not just my ideas, but is the 'standard theory' that nearly all automotive engineers believe and are taught.
It has been checked and agreed with by
a retired GM engineer who once headed the Corvette plant in Bowling Green KY,
by a native Japanese Toyota engineer at the Georgetown KY plant,
and by a retired Chrysler gasoline engine designer and later GE diesel design engineer for their locomotives.
http://www.dodgeforum.com/m_447500/tm.htm
It is best to print out that FAQ
and put it by the toilet
and read a little at a time while 'on the throne'
going back to re-read stuff that was not clear the first time
then pick and choose the mods that interest you
or that you think will provide the largest $ savings quickly.
If you think putting reading stuff by the toilet is silly
that is the advice that the chief judge of North Carolina
gives to new judges about how to learn the vast rules of court.
Corrections to mistakes in the FAQ are welcome
but please research your idea of a mistake thoroughly
and provide some backup from technically reliable sources
or results of careful experiments you have done.