Another vehicle?
In all seriousness, if you're driving 25k miles/year, a V8 4runner is probably not a good vehicle for you. That's a ton of miles (I think the average for most vehicles in the US is 12k - 15k/year.)
At 25k miles/year, averaging 16mpg you're using 1562 gallons of gas a year. At $3.50/gallon you're spending $5400 or so annually on gas.
If I was you, what I would do is shop around for a beater used car. Look for something like a Camry, Corolla, Sentra, etc. Something with a 4 cyl engine and a manual transmission. Depending on what the market is like in your area you can probably find one that is 10 -12 years old for maybe $2500 or so.
Those vehicles can easily get upwards of 30 mpg. Depending on how much driving you can shift from the 4runner to the economy car, you may be able to break even on fuel savings in a year or two. That's exactly what I did in 2011 when my office moved from the city center (where I rode light rail to work) out to the 'burbs where I drive every day.
Now some will say there are other costs associated with owning and maintaining two vehicles (maintenance, insurance, etc) and that is very true. However, on the flip side there are also some non-monetary advantages to owning a second vehicle: It gives you the flexibility of being able to have one vehicle in the shop and still be able to get around, it means that if you want to work on your 4runner you don't have to worry about completing your project by Sunday night so you can drive to work on Monday morning, etc.
There's also a savings factor that I think some people don't consider when looking at a small vehicle vs. a 4x4: How much did you pay for your tires? If you paid ~$200+ per tire, the you probably shelled out close to $1k just for your tires. Tires typically last about 50,000 miles so if you are driving 25,000 miles/year you will be throwing down another grand every two years, and most of the time you are grinding your tires down you are just driving to and from work or around town - that's a waste. Small economy cars, OTOH, have small, cheap tires that you can usually get for about $75/ea. You can buy 4 tires and be OTD for less than $400. So that's another cost savings that will help to offset some of the cost of owning a 2nd vehicle.
Obviously, the 2 vehicle solution doesn't work for everyone. If you live in a place where parking is very difficult or where getting a 2nd vehicle would mean renting a 2nd garage or parking space, then the numbers may not work for you. In that case the only advice I can give would be either (a) get rid of the 4runner and get something that gets better MPG, or (b) suck it up and figure that the cost of the gas you're buying is part of the cost of ownership.
arty: and diesel… mated to 6 speed trany...:behindsofa::lol:; and I am sure it will give you 20% improvement in MPG; 
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