For the last 2,5 years, I've averaged 13,4 MPG on LPG on a standard '88 RRC 3.5 EFI (cath) Auto with a decent driving style (always max speed in the Netherlands - 100/120 km/h).
Lately it's improving after changing sparkplugs (smaller gap to 0,6 mm / NGK sparks) and coil. And some fidling of the mixer-screw to optimize lean/rich filling while holding the power up. Resulting around 14,5 MPG on average.
The system is OMVL 90e with traditional mixer (a bit to small-35 mm). Mind you, I've a bit larger tyres so the speed and mile-counter are now spot-on (verified with GPS) which is a difference of about 6-7%.
Strange thing happened last week, after replacing rear diskbrakes and pads en regreasing bearings I suddenly went over 15,2 MGP over a long run. Could there be so much resistence in bearings and brakes that would cause this uplift? I'll find out in the future, and need to do my front end soon.
Next year I'd like to go to megajolt or megasquirt ingition/inj. and maybe even LPi to improve overall stability and improve MPG so the actieradius improves while driving abroad on holidays.
Has anybody experience with LPI/Megasquirt?
Regards, Gerard
