Thanks but I know that already, I'm not looking for economy, I'm just wondering how someone with bigger injectors, bigger turbo can get better gas mileage than stock fuel system and a T28. If you can't answer that just say so.
I don't think a bigger turbo and bigger injectors would affect gas mileage very much.
I only see a few obvious variables assuming proper functioning of the engine management, sensors, and injectors:
- extra parasitic drag (automatic transmission, AWD vs FWD, high rolling resistance tires, dragging brakes, bad wheel bearings)
- compression
- displacement changes (2.0 vs. 2.4)
- VE differences (intake, exhaust, head restrictions)
I would think a well modified DSM could beat a stock one as we often work to gain higher compression, better VE, and less aggressive fuelling at medium loading.