My wife drives 100 plus miles a day in a Jeep Liberty CRD. Those are hard to find and usually more than $10k. I drive an old Mercedes it runs great on grease. But it shakes and rattles and need minor work some times. and Major work some times. But it just keeps going. Also it will 99 out of 100 leak oil on your driveway. Like a good dog it likes to "mark" its territory.
I had a Dodge 12-valve. A good vehicle on the highway and towing but not much fun to park around town. A better version becasue it is smoother and not so old is the Dodge 03-07 Common rail version. Also more expensive. 05-06 Mercedes are wicked nice but $15k with really high mileage. Harder to convert also. The Ford with the 7.3 Powerstroke is a great truck also. If you work in a restaurant and have free access to oil do not worry about mileage.

Although I commend you for thinking about running on grease, I think you “newbie’s” are putting the cart before the horse.
 
I am not insulting you here!  We all started at one point.  In my opinion, the following should be your first concerns before you even think about purchasing a vehicle.  The best thing you have done (so far) is to locate this website.  I’m not kidding.  I lurked this site and read everything I could  find waaaaaaaay before I converted my first vehicle,  All the information you need are in the posts.  This is a great website!
 
1)    You should identify and/or have the space needed to set up your wvo storage (settling tanks and holding tanks) without drawing the attention of your nosy / whiney neighbors, wild animals, and/or local code enforcement officers!  In some municipalities, you will be breaking the law and/or have serious code violations storing and processing wvo.
 
2)     You should indentify how you are going to process (filter and pump) your wvo as well as set up a complete filtration system (after you design that too, by the way.)
 
3)     You should see if you could actually obtain wvo from various restaurants.  If you can acquire and/or purchase wvo, how are you going to collect it?  Trash pumps? Cubies?  Collection barrels?  5-gallon Homer buckets?  How are you going to transport it?  Did you know that some states actually labeled WVO as a “HAZ-MAT”?  I’m not kidding you!  Each method has their own advantages and drawbacks.  I have lost 3-suppliers last year due to many people jumping into this “hobby” while throwing ridiculous money around to obtain wvo.  This is a fact.  If you are thinking about “dumpster diving” please Google “wvo theft” every week.  You are going to read more and more people getting arrested for sucking out dumpsters.  I have a friend out in Illinois that told me one of his “stops” has a new security camera pointing right at the dumpster.  If you do strike a deal or two getting wvo, you MUST collect it when you agree to.  Keep the area clean too.  If you become a hindrance to the business, you will lose that supply.  If you go on vacation, you must get someone to collect your oil for you or you will lose that supply by either someone jumping over you (or stealing it behind your back), or the restaurant simply selling it to someone else because of your inability to keep your word.
 
4)    How are you going to dispose of your nasty (and I do mean nasty, very nasty) garbage, wvo dregs, cubies, rags, absorbent, cleaning chemicals, etc!  FYI:  You should have a set of “WVO WORK CLOTHES”! 
 
Running grease is NOT plug-and-play.
 
If you are not good with a wrench, then this "hobby" is not for you.
 
You are going to spill wvo, get messy, and generally curse yourself many times over…..Trust me on this!
 
After you set up your system (in your head is fine), then look for a vehicle.  I personally bought an early 80’s piece of junk to experiment on (I’m still running it) HOWEVER IT IS NOT MY PRIMARY VEHICLE!  If you are thinking about greasing your primary vehicle, you WILL be let down (especially when you need it the most and dressed well too boot).  You will experience malfunctions, breakdowns, and frequent towing…….I guarantee it.
 
When I got familiar with everything I mentioned above, I graduated to a 1992 Dodge Cummins and ran that for 5-years.  Now I am starting to work out a conversion a 2003 Ford Super Duty Crew (in my head) while still running the Dodge and the VW.
 
I am under the belief that you should drive a vehicle you are comfortable with and one that fits your body and safety needs as it relates to your driving habits.
My VW (Rabbit Pick Up) is used as a city run-a-round and an equipment trailer that I occasionally pull up to the mountains in the summer time.
Interstate travel is in the Dodge only.  I am 6’3” and there is no way I would want the commute you good people have mentioned without being in a LARGE VEHICLE!
I just read what I spent an hour on and realize that it may sound a bit negative.  My intent is not to discourage you.  I think it prudent to inform you of the pitfalls you will encounter.  If you are up to the challenge, go for it!
 
Just one more (sorry):  Keep your mouth shut about what you are doing!  I mean it!  I really do not care what your motives are in starting on wvo (saving money, saving the African Muck Muck Bird, feeling warm and fuzzy at night, whatever.)  The Federal / State / local Government(s) will not be your friend on this (nor the oil lobbyists.)  States are broke and they are looking for ways to generate more revenue.   Do not put bumper stickers on your car either.  Do not advertise your wvo usage.  I know who is running grease because I can smell them.  As I pass, I give them the "thumbs up"!   Part of the problem (that I see today) relating to the lack of wvo supply (in my area) is that too many people are competing for the same oil.  In addition, more will no doubt be surfacing due to the higher fuel prices we are now experiencing.
 
Well, I wish you luck.
 
Good luck.
 
Slate

Thanks bro,  I’m just trying to help because I have seen people get burned real bad (present company included!)
I hear you about "knowing what we know now" statement….it is so true.
 Running grease is definitely a discipline. 

Best to start with a cheap POS.  VW are easiest and cheapest to find.
JP.

Cjate:
Comfort in my book is the #1 issue.  Size DOES matter when it comes to choosing a vehicle's comfort.  If you can find an owner of a MB SDL model, ask to take it for a spin on city streets (pickup in traffic) and on the freeway for high speed crusing (long term comfort in a car seat).  IMHO, the SDL offers the best comfort.  One item to be concerned though, the head can be the problem. On the left side of the head look for the casting numbers.  The problem head deals with the last two numbers.  If the number is 14, then this is the problem head.   There are some cream puffs out there.  One of our Greater San Diego Greaser just purchased an '87 MB 300SDL with 140K on the clock, all the records from the original owner, no chips, dents, glass not pitted, no paint fade, one inch section of the driver's seat stiching has come apart.  Price was $5700.  The car is just gourgus!