Which brands offer the most durable and fuel-efficient bulldozers?

I visited a heavy equipment dealership two days ago because I wanted to learn which brands offer the most durable and fuel efficient bulldozers. A land clearing and grading project may start near our area soon and honestly fuel costs and repair bills are the two things worrying me the most before buying any machine. I wanted something reliable and economical. I wanted a bulldozer that could handle long working hours without burning too much fuel or breaking down often. But when I checked the bulldozers I felt confused very quickly. Some machines looked very powerful but the fuel numbers still seemed too high for daily work. Some newer bulldozers had eco modes and smart controls but the prices also felt much higher than expected. Some sellers talked about strong engines and durable tracks but honestly many machines still looked similar to me from outside. One salesman keep saying premium bulldozer brands always save more fuel in the long run but I still was not fully convinced because the maintenance plans also sounded expensive. I could not trust them and I could not decide confidently.

Then I visited another supplier in the same area because I thought maybe I would hear more honest experiences there. This place had bulldozers parked outside with operators and mechanics checking machines around the yard. Some Caterpillar bulldozers looked very strong and smooth during operation. Some Komatsu models sounded quieter and operators there kept praising their fuel efficiency during long work hours. Some John Deere bulldozers looked practical and easier to maintain for regular construction jobs. I remembered hearing about a contractor near our city who used the same bulldozer for many years because the machine stayed reliable even after rough daily work and heavy loads. That memory stayed in my head while I looked around. One bulldozer almost looked perfect but the spare parts later sounded very expensive and difficult to get quickly. That made me hesitate even more.

To check more variety and options while scrolling many online marketplaces including alibaba I started comparing bulldozer brands and customer reviews from different suppliers. Some bulldozers focused on fuel savings and smoother controls. Some looked very durable while others looked too expensve once transport and servicing costs were added. Some reviews praised reliability and lower fuel use while others complained about costly hydraulic repairs and electronics later. I felt excited seeing more choices but also confused agian because every company claimed their bulldozer was the most durable and fuel efficient one available. Now I am thinking if paying extra for trusted bulldozer brands is really worth it for long term savings and durability what would you do in my place?