Can any one explain me this thing please??

Little story!!!
People have asked "Wich car is best"???
FORD have answered - "best car is - a new car! No matter what brand"!!!

 

Now your talking personal preferences, personally I LOVE Freightliner trucks, so if your asking opinions don't start trash talking brand names!! Your not really asking for unbiased opinions, your looking for an answer that makes you happy. Well some people like K-Worths some like Stars some like Pete's, people find what works best for themselves and will make it work well if they like it. I've got CAT and Detroit engines in my three truck fleet all stuffed into Freightliner chassis's and I like them both, they each have there pro's and con's.

 

Look into the Ford/Sterling trucks. They're very economical and relatively cheap on maintenance. A really good overall truck. Easy to find them with the N14. There aren't mainy around (probably had 1% of sales in their prime) but if I had to buy another truck, I'd get a Sterling. Without trying I can get 8.8xx MPG (running at 62mph). Had to hammer down @ 70mph scaled @ 76k and still pull off 7.4xx mpg. You can ALWAYS add more HP/TQ so don't worry about that. 3.50's would be a good ratio on a 13 or 18 SPD.