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.

[Literati914]

On the subject of AFR and mileage - I remember watching a video on YT, where the driver of an old school 911 (while basically being interviewed by the channel's host), running thru the twisties of some northern California mountain roads - would manually change the A/F ratio on the fly via a knob he had installed between the seats!!

I think he may have been running carbs but can't exactly remember. I thought that was kind of a slick solution and may try to mimic it at some point. Anyone heard of this before? Know how that could be done?

[brant]

On the subject of AFR and mileage - I remember watching a video on YT, where the driver of an old school 911 (while basically being interviewed by the channel's host), running thru the twisties of some northern California mountain roads - would manually change the A/F ratio on the fly via a knob he had installed between the seats!!

I think he may have been running carbs but can't exactly remember. I thought that was kind of a slick solution and may try to mimic it at some point. Anyone heard of this before? Know how that could be done?

Can’t change AFR on the fly with carbs
As it would require a jet change on the carbs


Easy with djet
Possible with modern injection