Let us make a list of actual efficiency gal.-lt./KM optimizer,beginning with
no/low financial investment:
Eco-drive(up to -15%)
www.ecodrive.org/Liquid fuel treatment(f.e.):
www.abis-tech.com/index.html ,India
www.thehindubusinessline.com/2005/08/14/stories/2005081401440200.htmwww.bioactiv.com.ph"water-fuel/-gas":
LAN-gas,ReLoaded Fuel(-40% !?),Alco-diesel
Rudy Lantano,RL Enterprise,PHP
www.dost.gov.ph/media/article.php?sid=336but:
www.poblaw.com/PoblawMarch.pdf ,page 2:RL Fuel savings=8,5%
Liquid engine/gear/transmission surface treatment(f.e.):
www.Motorkote.comtire sealant
www.airseal.cc/Mechanical/electrical fuel treatment:
www.greendieselcorp.com (AUS)
Nuvitron(PHP),ultra-sonic
Kompanek,US4038348(~
www.welt.de/data/2005/11/12/802384.html?prx=1 )
Commercial Hybrid conversion equipment:
www.swr.de/rasthaus/archiv/2006/02/18/beitrag4.htmlwww.innovationsreport.de/html/berichte/automotive/bericht-33357.htmlPower Hybrid(DE),Manfred Sonntag ,"7lt./100KM to 4lt./100KM" reported
OEKO-Tuning:
www.zeit.de/archiv/2000/15/200015.oekotuning_.xml?page=2Wolfgang Krause(DE),"5,1lt./100KM to 3,4lt./100KM"reported
Start&Stop-device:"Startronic"
www.spritsparen-city.dePeter Krause,Berlin
Regenerative Braking-device:
www.index.co.za/fuelmaster/Fuelmaster(ZA)
HHO-Cell:
www.autogas-india.com/fuelcell.htmlAutogas-india
Combinate yourself:
as "expensive"example,ca.3000 Euros investment(without car),
new 5,1lt.SEAT Arosa: to 3,4lt. Krause OEKO-Tuning
+ Sonntag, Power Hybrid:?-3lt./-2lt.?
+Autogas-india HHO-cell:-30% fossil fuel
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total/fossil fuel consume now

Sincerely
Lanca
p.s.: this is only the listing of different possibilities to reduce the fuel consume,
the "trademarks" are unimportant( I have actually not commercial relations/
agreements with these companies) only to give a help
where to get more information about less-fossil-fuel-consume-technics!