Driving around in my automobile, The 3.2 giving me about 32 mpg. Flipped HB Options

[worn]

I been driving my 914 this summer. Closing in on 5 Kim so far this year. When I go, I get the highest octane that I can find; 91 or 92 with no EtOH where I live, trending towards more ethanol as we get west. So, I have been old guy writing down the numbers and have consistently hit 31 -32 mpg. This decreases if I leave my gas cap off just before a drive with the RRC 2024 folks.
The interstates let you drive at around 80 mph, and that adds up to a light throttle 3,000 rpm with my gears. The car must be pretty good with airflow.

[technicalninja]

My 2056 gets around 24-25 mph at 3400-3500 rpm. AFR is around 32-34. Check your plugs to make sure you are not running lean.

Your AFR numbers are different than mine.

Air/Fuel ratio is usually based on air by weight/fuel by weight and stoic is 14.7/1

Often folks leave off the one.

14.7 is "perfect" combustion with exactly the right amount of oxygen to fuel for complete combustion of the fuel with "hopefully" the least amount of CO and HC being produced.

12.5 is rich, normally a max power mixture.

10.0 is PIG rich

16 is getting lean, some cars will do OK running 16. This is the beginning of "lean burn" IMO. You only want to see as high as 16 in cruise at speed.

18 is dangerously lean. A few max effort fuel economy vehicles run this high.
You need computer controlled hyper fast FI with multiple knock sensors to make this work.
Run an old school T4 with carbs at these numbers and you will MELT stuff...


What does 32-34 refer too?

The mileage numbers that members have been posting are interesting.
Even seriously modified cars can achieve decent numbers if driven in a "highly responsible" manner.

And that is NOT how I'd drive those cars. (IMG:style_emoticons/default/devil.gif)

[Geezer914]

My 2056 gets around 24-25 mph at 3400-3500 rpm. AFR is around 32-34. Check your plugs to make sure you are not running lean.

Your AFR numbers are different than mine.

Air/Fuel ratio is usually based on air by weight/fuel by weight and stoic is 14.7/1

Often folks leave off the one.

14.7 is "perfect" combustion with exactly the right amount of oxygen to fuel for complete combustion of the fuel with "hopefully" the least amount of CO and HC being produced.

12.5 is rich, normally a max power mixture.

10.0 is PIG rich

16 is getting lean, some cars will do OK running 16. This is the beginning of "lean burn" IMO. You only want to see as high as 16 in cruise at speed.

32-34 it is supposed to be 13.2-13.4 AFR.

18 is dangerously lean. A few max effort fuel economy vehicles run this high.
You need computer controlled hyper fast FI with multiple knock sensors to make this work.
Run an old school T4 with carbs at these numbers and you will MELT stuff...


What does 32-34 refer too?

The mileage numbers that members have been posting are interesting.
Even seriously modified cars can achieve decent numbers if driven in a "highly responsible" manner.

And that is NOT how I'd drive those cars. (IMG:style_emoticons/default/devil.gif)