Researching a number of 125cc motorcycles has shown that they are indeed considered to be fuel efficient. These bikes are commonly used in India due to their fuel efficiency.
Many SUV's are not fuel efficient.
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!
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.
There are several places you can look online to find a list of the most fuel efficient cars. Check FuelEconomy.gov, they have a pretty extensive list. CNN recently did a story on the eight most fuel efficient cars. Check out their report.
In general, yes. But it actually depends on the motorcycle and the car in question. It would be possible for a VERY big motorcycle to have worse fuel economy than a very small, efficent car.