Well, it's a long hard work I did for a year ago, since 2006.  Our
combustion system is not yet at the peak, average mechanic will disagree
with this, but that's their problem.  There are frictions in Japanese
cars, some on German cars, there is room to improve to get better MPG.  I
fixed my Infiniti and Mercedes C280, the result is amazing.   I bought a
full tank of gas that last 3-4 weeks.  I saw 40-MPG on my C280's display
board.  If you want me to prove it to you I can if you're not too far from
my state. Sorry I can't tell you much detail because I should be rewarded
for this discovery.  US government should pay me, then the oil problem can
be resolved, at least by 1/2 very quickly.