12:30 I'll be short tonight as i drove 220 miles and i'm kinda tired though i got something to say. I think i figured why i always get better mileage with fresh gas, no matter the station. I think they put in the gas some additive to increase octane number that is volatile and goes away in a couple of days.

With today's knock sensors and stuff, you can use a variety of fuel grades because the system will adapt, however you will get better mpg with higher octane gas if only because the timing advance can be increased without knocking, which increases efficiency.

But we have to somehow explain the phenomenon on of gasoline going "stale" encountered by me for so many years now. From my past experiences, fresh fuel gives up to 10% better fuel mileage.

But first let's take a look at your fuel tank. It is connected with a charcoal canister that catches the vapor and releases it in the intake, in cycles.

The other two major addition to the intake manifold of modern engines, besides injectors, are PCV and EGR systems. I was intrigued for a long time with those until i figured what they do.

PCV relieves pressure build in the engine by exhaust escaping the rings of the pistons and recirculates them in the intake, instead of releasing that exhaust in the air and polluting, and EGR also recirculates a small amount of this time raw exhaust exhaust back into the intake, with the purpose of slowing down the burning inside the combustion chamber, with an effect similar to using higher octane fuel.

While PCV works with the vacuum of the intake, increasing return at higher vacuum, EGR is computer controlled. I believe PCV complements the EGR since some of the blow by is exhaust. So here we look at the concept of reducing pinging while increasing timing with the help of exhaust, used for decades.

Raw exhaust (before the catalytic converter) returned by EGR contains mainly carbon dioxide and the inert nitrogen that passes unchanged through the combustion chamber.

I did a few google searches to make sure. First, if CO2 can be used to improve octane number in a fuel and the answer was no. However, indirectly google said that CO2 can be dissolved in gasoline and we know that CO2 from EGR slows down burning.

I think you know by now where i'm getting at. Theoretically you can dissolve CO2 in gasoline and that would slow burning, with the effect similar with using a higher octane gasoline, however, CO2 being a gas it can escape the gasoline by degassing and leave the tank through the evap system in a couple of days in a way similar to soda going stale.

The underground tanks in gas station are sealed, otherwise we will fill a smell. More than that, modern pumps have at the nozzle a capturing system and a return circuit for vapors displaced from your fuel tank bringing that vapor in the tank below. The gasoline must stay in close containers from refinery all the way to your fuel tank. But there, we have the evap system that captures and releases the vapors in the intake.

No i don't believe gas station owners know about it, if it's happening, it's happening at the point where they put in the additives and even those guys might not know what's in those pressurized bottles.

Anybody would try to take a sample in lab for analysis would seal that bottle (nobody likes to smell gasoline) and the gasoline would not go stale and the result will come out right.

But everybody can easily verify this theory without any lab.

First must find a window with three days of constant weather including the wind, rain, etc.. which is easy in some states. Go to a gas station, fill with fresh gas and drive 50 miles at night  where there's no traffic, no major level differences and constant speed. Do not modify tire pressure. Do the same thing two days later at the same hour (in other words, in identical weather conditions) with the same gas left in the tank.

Wet streets by example, besides the extra resistance to movement by loosing energy while throwing water from the road in the flaps and behind, the braking effects of the poodles, they also cool the tires, decreasing tire pressure.

But first you have to identify, using the manual, the MPG indicator on your dashboard.

If this can be reproduced, i can see here the shadow of a huge scam but i really don't believe they're doing it for money, as for religion reasons.

As i tried to explain many times, there are at least two sects, one Christian (Dominicans which are most influential in the Catholic Church) and possibly Zen Buddhism interested in either rushing in the apocalypse for the purpose of rushing Christ back on Earth or heating the planet as in Buddha's Sermon of the Seven Suns thus bringing Nirvana (extinguishment) for all to end all sufferance and death-rebirth cycles.

1:00 AM Yes i had to fill at the station on the hill in Warm Springs and for some reason i fail to understand, Super gasoline was almost 2 dollars over Regular (got a picture to prove it, tomorrow) so i filled with Regular.

This way the instant mileage for the trip was 45, with Tualatin being some 1300 ft below the starting point, and with fresh Plus the way the car is setup right now, with new ignition coils, would have probably been 48, beating some hybrids (on freeways with no stops where regenerative braking doesn't matter so much).

7:55 Slept 5 hours, got awoken by the smell of poop. Found some, the usual, but then in the area in front of the door it was smelling like a dirty toilet.

They got their algorithms. One of the feral cats pooped in the area most dark, "to mark its territory" with bacteria and parasites. Somebody or something scared the cat though and it left the hole uncovered. Cats, especially the feral ones being by themselves, unlike dogs on leash, dig a hole, cover it with dirt. Here they probably confuse the dirt with redwood dust which does not seal it.

However somebody or something scared the cat and the hole was uncovered and the poop was exposed to air which brought a different smell which i did recognize immediately. Started the ozone to deal with what's left in the air inside but it takes time.

10:15 The Universal Translator is here.

12:10 I finally found some time to remove the microSD card from the phone (i don't want to turn it on, use wi-fi whatever).

12:40 Sammy opened up a bit last night about his first band and his hero, David Bowie, who appeared like an alien when he first burst on the scene (was that Major Tom?). What else came good from him (that would still be on the radio)? Under Pressure with Freddy Mercury, what else.

He thus explained why his first album was named the Rise and Fall of Ziggy Stardust... Ziggy, Xenu.

I think he appeared in my life once acting as a mechanic or owner in an exhaust shop here in Tualatin, he was either angry or in some sort of pain. In the same evening almost got into an accident with a truck trying to merge into me from center lane here on 65th i think days before or after he died.

Never liked David Bowie. To me he always sounded like a straining fainted cat.

3:00 But it is also possible that the most volatile additives of the gasoline are caught by the evap system first and brought in the intake and being burnt in the engine without any benefit while lowering the octane number of the gasoline in the tank after days and even hour since the last fill-up. That in the case of a tricked out gasoline.

A gasoline that comes from refinery with a higher octane number does not need these additives but is more expensive.

12:20 AM I knew there was something going on cause it happened to me too many times. Basically since i bought the first car in 95, my 83 Fairmont i noticed a temporary better power or response to gas pedal (and where there is better power on the same engine or car you get more miles per gallon) right after i bought gasoline but never had such a tool like MPG indicator, with data coming from injection time from the computer itself to prove it.

That car did not have a knock sensor or computer controlled ignition timing but a higher octane gas would prolong burning inside the cylinder, with a longer time for energy transfer between the piston and the crankcase.  The evap system was introduced in the 70s but even if it was malfunctioning which i think it did, the most volatile components of the gasoline which are the BTEX additives could escape by a not so tight gas cap.

Though even with that indicator is hard to prove because of so many factors influencing the fuel mileage.

I remember i noticed a hissing at my previous cars with air being sucked inside when opening the cap due to vacuum present inside the tank, due to malfunctioning of the evap system when manifold vacuum was applied all the time directly to the gas tank.

Would have never figured it out if it wasn't for the long boring trips at night on mostly the same empty roads and of course without having the MPG and tire pressure indicators with refueling when coming back home.

Yes i went earlier again outside, went by the smell, found another cat poop next to the basement vent, under our kitchen window. Somebody brought a bunch of red dust, inviting the cats to go there. Now i started the ozone, waiting for the smell to clear.

12:40 Last 24 hours trips. One coyote, several deer in three different encounters. One mama racoon with three little ones when we got home. One guy looking like Phil Collins attached by a leash to a black dog servicing the dog right in front of us at Road's end when Angela finished preparing the salad made of the last tomatoes of the summer from the garden .