If you check the page on Elroy (the car) you'll see a BSFC chart that I borrowed that is for a similar engine as mine.
" *BSFC chart...vertical line lower left is typical CRUISING speed RPM vs LOD/torque values....middle vertical line is RPM vs LOD/torque values when accelerating at ~ 2100 RPM...oval represents RPM vs LOD/torque values when accelerating at ~ 32 TPS.
Shows that TPS at 32 to maybe 35-36 (up to 3000 RPM) is more efficient (most efficient = 245 center area)."
...
EcoModder Garage image
On this chart the middle red line shows "efficiency" when RPM is held at 2100...typical easy driving mode.
The oval shows efficiency when throttle held at 32 TPS....more efficient.
I try to stay under or around 37 TPS...which I assume is in the 245 center area...most efficient operation.
If you look at the chart "areas" you can see that efficiency doesn't drop off much at higher throttle positions...so sometimes I'm up into 42 TPS or so.
Main thing you need to watch is whether you are in
closed loop (stoch ratio) or not...my 03 Focus will stay in closed loop at pretty high throttle positions....whereas my 86 Nissan truck (1st year fuel injection) will barely stay in closed loop at cruise speeds...slightest hill and it goes open loop.
Another issue is extra wear and tear on the drivetrain...which I figure I compensate for by using synth oils and additives.
I've also found that if I slow too soon for a stop...I can still see some good mpg by feathering the throttle to 17-18 TPS coming up to a stop. Idle for this car is 16 TPS.
I also try to keep my speed up on corners...within reason...and can do this by using some rubber donuts (as tested in police academies nationwide)...one in each spring. This give much better handling than stock. Also tire pressures a bit over door sticker numbers.
Amazon.com: Superior 18-1901 Donut Style Coil Spring Spacer: Automotive
You put these between the coils....sometimes you might need to drill a hole in each end and loosely wire them to the coil.