A good 4x4 small truck with good gas mileage is a Chevy or Ford pickup truck. Those have always been some of the small 4x4 trucks that have had good gas mileage.
Wildfire. See related link.
Dependable, poor fuel mileage.
Yes, a vacuum leak will be detrimental to fuel mileage.
25mpg
Have a 1995 S10 and have a steady gas mileage of about 30 mpg. The truck is kept in good tune and try to keep it at the speed limit. This truck is also a 4x4.
The five speed, two wheel drive Toyota Tacoma has the best mileage, checking in at twenty two miles per gallon. It not only has good gas mileage but it is also a very dependable vehicle to have.
The brand is not really the issue.Basically any truck that is aerodynamic will get good fuel mileage. but for really big tractor trailors i would say the international lonestar. but if you want a smaller truck i think Chevy kodiak 7500
A car with good gas mileage would be the ideal for traveling long periods of time in cars. I would further suggest either a small car over a SUV or truck.
A 2010 ford fI50, red ext cab, great truck good gas mileage, not expensive, and is easy to find, max. price 25 500$
Considering that a diesel pickup truck can't use gas I would say that there aren't any diesel trucks that get good gas mileage. If you were wondering which diesel truck gets the highest miles per gallon then I would say you should look at the Dodge Cummins diesel.
Your truck sounds like it doesn't get very good gas mileage. Try making sure there is nothing in the bed of the truck to cause the truck to pull more weight then needed, also, make sure your windows are up at all times, so air flowing in the window doesn't slow down acceleration.
Keep the tires at the correct pressure, tailgate up, drive for mileage as in slow starts, and driving the speed limit. Remove all weight you do not need to carry. Use the A/C on the highway and turn it off in the city. If the truck is tuned up and running as good as possible that is about all you can do. Pick-ups do not get great mileage and if you own one, especially a full sized truck, you live with it.