Whoa, whoa, WHOA! Easy now. Let's not get TOO drastic here
. Small steps. I suggest taking your next 5 years and keep track of your consumption, average them out to get a proper baseline, and then some A-B-A testing to make sure this is a viable mod
.
Seriously, for me, there is QUITE a lot on my plate for 2012;
Install a diesel engine in the Jetta,
Finish the tail and paint the whole car,
Install a second fuel tank for WVO( with all the controls and guages),
Travel out to Boneville and back home safely and economically,
Find someone playful in the diesel column to banter about our numbers
.