Here you go for those on a budget or those just wanting to save greenhouse gases check this out

http://www.dragonext.com/mini-socket-car-vehicle-fuel-save-economizer-auto-ga...

mate there is no way a plug in device can save you fuel especially if it plugs in to the ciggie lighter socket.
heres the thread on the rest of them it may already be in there
http://forums.aussieveedubbers.com/viewtopic.php?tid=55098 

Might have to get two! An extra one for the misses car

I might install 3 and cut my fuel by 90%!!!! m

Get three and it can actually feed fuel back from the carby into the fuel tank while driving!

Best mileage is ~ -5 mpg city or -20 mpg country.


I also saw this adjustable power band which people might find interesting...
http://kalecoauto.com/index.php?main_page=product_info&cPath=1&produc...

OK....

MAKES YOUR CAR GO BETTER FASTER.....
SAVE FUEL.... ETC....

BUT HOW DOES IT MAKE YOUR BATTERY LAST LONGER????

Stuff it, I'm off to get a few and I'm gunna put one of those double addaptor thingies in the cig lighter so I can run morn one, the Soob has a few cig sockets so it orta b rite, bloke down the petrol station's gunna b pissed, I prob wont need ta go there eva agen.
Just thorta sumpn else, ifn I pain the car red it'l go farsta two so I'll get there quicka wiv less petrol excellent.

It's a minature flux capacitor that will put power in your car, causing the alternator to start turning and acting as a motor like all new hybrid cars. Everyone can turn their cars into hybrids. Plus the flashing LED has the bonus of being an anti-theft device.

Oh wow, thats even better than DEI

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How many would i need for a V8 powered Kombi

It might depend on how many batteries you have - I don't know if you would need to count ancilliary batteries, like GPS, Clock, etc.