The Hummer H2 is basically a GM big SUV (think Suburban or Envoy) frame and engine with some "tougher" looking body panels.
Sooo... if saving money on gas is an issue, then buying another vehicle in that same size/engine class won't make much sense. (In other words, the Ford F150's and Chevy Silverados.)
The Tundra is a little better, and the Tacoma better yet.
However, I suspect that if your parents can drop the kind of cash necessary to buy you a SECOND vehicle, then they can probably afford to insure it for you as well as help subsidize gas.
One other point - to get one of the fully decked out big trucks mentioned in some of the above posts, you're going to have to tack on some significant coin on top of your trade-in. I would strongly recommend looking closely on how much additional it is going to cost you up-front and on your monthly car note to save money on gas and insurance. I would be surprised if it is worth it.
For example, let's say you drive 15,000 miles a year.
If the H2 gets 13.5 mpg, it took you 1,111.11 gallons to drive those 15,000 miles. At $1.80 per gallon, your yearly gas bill would be $2000.00, or $166.66 a month.
Now if by some miracle you find a truck that averages 20mpg, then it would take you 750 gallons to drive for the year. At $1.80 per gallon, your yearly gas bill would be $1350.00, or $112.50 per month.
The difference between 15,000 miles a year in a vehicle that gets 13.5 mpg and one that gets 20mpg is $54.16 per month.
So to me the question you should be asking, if saving money really is your highest priority, is:
Does your monthly car note after the trade increase more than the $54.16 in gas savings plus insurance savings that you'll realize each month?
After all, it really doesn't make sense to spend $100.00 more per month on payments to save $55.00-$75.00 a month in gas and insurance.
Unless you just really, really want a new truck and are looking for an excuse to get one...

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