wulfram- I thought you would like to know the following. By achieving the milage you do, you have increased the O2 content of your emissions. That extra O2 does 3 things: It produces the following gases:
1- Nitric Oxide, NO
NO is an important regulator and mediator of numerous processes in the nervous, immune and cardiovascular systems, including smooth muscle relaxation thus resulting in vasodilation of the artery and increasing blood flow, neurotransmission in the nervous system and has been associated with neuronal activity and various functions like avoidance learning, macrophage mediated cytotoxicity for microbes and tumor cells. Besides mediating normal functions, NO has been implicated in pathophysiologic states as diverse as septic shock,hypertension, stroke, and neurodegenerative diseases.  Currently, exogenous NO sources constitute a powerful way to supplement NO when the body can not generate enough for normal biological functions. So, recent developments of novel NO donors, NO releasing devices as well as innovative improvements to current NO donors have been investigated. 
Nitric Oxide (NO) is of critical importance as a mediator of vasodilation in blood vessels. It is induced by several factors, and once synthesized by eNOS it results in phosphorylation of several proteins that cause smooth muscle relaxation. The vasodilatory actions of nitric oxide play a key role in renal control of extracellular fluid homeostasis and are essential for the regulation of blood flow and blood pressure. . This also plays a role in erection of the penis
2- Nitrogen dioxide: NO2
Nitrogen dioxide is formed in most combustion processes using air as the oxidant. At elevated temperatures nitrogen combines with oxygen to form nitrogen dioxide: It is one of the several nitrogen oxides. This reddish-brown gas has a characteristic sharp, biting odor. NO2 is one of the most prominent air pollutants and a poison by inhalation.
2O2 + N2 â†’ 2 NO2
3- Nitrous gas: N2O
It is used in surgery and dentistry for its anesthetic and analgesic effects. It is commonly known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its recreational use as an inhalant drug. It is also used in motor racing as an oxidizer to increase the power output of engines.
As you can see from the above, people who follow your car are either: 1- driving with extreem erections,
2- becoming comatose from being slowly poisoned :gasp:or 3- laughing their ass off.
I have an assignment for you. Now that you have tweeked the formula (14.7:1) in favor of milage, get you car unofficially smogged and see what kind of tail pipe measurements you have. I don't know what state you are in, but in CA we need to get smogged every other year.
BTW- if you see your have quite a caravan following you when you drive, it is probably due to reason #1 & #3 and not to tin foil