Electrics, followed by diesel, followed by steam.
Many SUV's are not fuel efficient.
The fuel tank on a locomotive is under the locomotive body, between the trucks.
The honda cb 110 is the most fuel efficient motorcycle in it's class
The most dependable fuel efficient car of 2014 is the Ford Focus.
The 2012 Mitsubishi is one of the most fuel efficient SUVs in the market. It has 112 MPG and is very fuel efficient. I recommend the 2012 Mitsubishi for your needs.
Www.utoGuide.com has a list of the top ten most fuel efficient pickup trucks for 2013. Www.shopautoweek.com also has a list of its top four most fuel efficient pickup trucks.
The most fuel efficient vehicles on the market today are usually hybrids. However, many small and economy sized vehicles on the market are not hybrids but are very fuel efficient as well.
A bicycle!
Locomotive trains typically run off of either electricity or diesel fuel. A locomotive has a large compartmental container under it that holds roughly 2,200 gallons.
The most fuel-efficient roof rack available on the market is the Thule Aeroblade Edge.
There hasn't really been a brand of semi trucks recognized as the most fuel efficient. Since they run on diesel a more efficient fuel, semi trucks already are more fuel efficient than cars in terms of size and power.
Ford makes an SUV that are fuel efficient and considered to be luxury by some. Most of the high end automobile companies now have an SUV that is fuel efficient.