water-methanol injection works. Period. But, echoing on Meister's post, medyo iffy ata kung lalagyan ng water/methanol injection or "HHO" system yung mga jeepneys. may consumables kasi, there might be a propensity na hindi mamaintain yung mga ganung add-ons.
for the price of an "HHO" system, I think it would be a better investment to simply replace or recalibrate the fuel injectors. (kung 15k, ayun pwede na pambili ng injectors yun)
btw, pano pala kung N/A yung makina nung jeep?





