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Smart Fortwo Passion Coupe. 38MPG 'official' highway while unofficially up to 46-48MPG and in my part of the United States there are no hills or slopes. Just flat land and small dips here and there. Plus parallel packing with them is a breeze.
 
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You're right, we are too reliant on cars. This makes it tough for anyone who genuinely needs their car for work, because incentives to get people off the road hit those people most. I'm a musician and make a living carting around a heavy keyboard and performing in far away places. Wherever possible I'll car share, but it's not always an option. I need my car, and increases in fuel might price some people onto public transport but I genuinely need a car.

Yes I can understand, along with the people that are disabled or can't walk very far. Without a car they'd be struggling.
 
Toyota Prius For Life Baby!! If you're in So. Cali and don't own one something is wrong with you! The car pays for itself!

In my garage I also have a few gas hogs though, 2001 Volvo C70, 2003 G35 Coupe, 2006 Porsche 911 Carrera.
 
Whatever car you have, convert it to LPG. That's good for the environment and good for your pocket, if you have tax reliefs on that like us EU citizens.

There are some concerns with LPG. Source.

Is it allowed to park a LPG vehicle underground in public garages? Are there any other restrictions?

All the vehicles with a LPG conversion kit installed after the year 2002 (and therefore in compliance with the Regulation ECE/ONU 67/01) can park until the first floor of underground garages, also if it communicates with a lower floor.

On the contrary, the vehicles with a LPG conversion kit installed before this date, and so they do not comply with the safety systems of the Regulation 67/01, can always park in garages just in the outside floor, not communicating with the underground floors.

The conformity to this regulation is so indicated in the car logbook “INSTALLATION EQUIPPED WITH SAFETY SYSTEMS ECE/ONU 67.01”. For what it concerns the transport by sea with ferryboats, the LPG vehicles have to be declared when you book your travel.

On the contrary, for air and railway transport there are no prohibitions, as for the transit in galleries, tunnels or viaducts.
 
So these measures are taken because of the potentially explosive propane in the tanks I suppose.

Well, at least if you start the LPG-converted vehicle, it takes a while till it drives on gas because the engine needs to reach a certain temperature.

And approaching cars are not exhausting pure inflammable propane but less CO2 as you may know.
 
I'd use my money to tell Congress to subsidize research into alternative energy more :p
 
So these measures are taken because of the potentially explosive propane in the tanks I suppose.

It's when it escapes that the problems escalate quickly.

"Unlike natural gas, propane is heavier than air (1.5 times as dense). In its raw state, propane sinks and pools at the floor. Liquid propane will flash to a vapor at atmospheric pressure and appears white due to moisture condensing from the air."
 
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