96 kw w900l fuel economy

Can anyone tell me what to expect for fuel economy on the w900l? I'm going to be an oo and a new truck came available that I'm looking at. Specs are cat 3406e recently rebuilt, remanned 18 speed set up for end dump and permitted for 102k. Someone was telling me that setup i wouldn't get more then 4-4.5 mpg but he has never driven one. The other truck i was looking at was an 01 international 9900i with a cat 6nz 18speed just rebuilt with a diesel freaks module that gets 5-5.5 mpg. Any info would be awesome!

 

Thanks for the info. My step dad thinks he knows everything because his buddies have them. He hauls livestock in Iowa with a Volvo and thinks i should get one. My thought is with all the dump trailers and such running old classic style trucks with big hoods and big motors in the northeast there has to be a reason. Gearing I'm not sure. The lady was supposed to email me pics and info yesterday and never did so i should hopefully find out today. When i do I'll post the details. I know the international has a rebuilt 475 cat pushed to 550 and he has been running a bully dog on it for the last year but if i got that one it comes with the diesel freaks harness. I can't imagine the kw would get much worse fuel economy. Plus it looks nicer with a bigger bunk. Int has 48 inch and kw i believe a 60. Just want o make the right choice s it's my first truck. And i also know 1 mpg can make a 20k a year difference as far as fuel goes if you average over 2k miles a week with diesel being 4 bucks a gallon in ny

 

So here is the info. Motor overhauled in 08but only has 300k on it, remanned tranny with 18 months left on the warranty, new suspension with 8 bags. few add on chrome pieces and 3.55 gearing all for 25k

 

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Turning i can deal with. I didn't even ask what the empty weight was to compare. But the international is double framed plus a couple extra storage boxes so i would imagine they might with close. It'll be permitted for 102k so i will have some wiggle room anyway. My biggest thing is comfort. I was uncomfortable in that international when i took it around the block and the mattress is against the seat. So since i have kids i want to bring with on occasion the kw seems a little better. And the international is a 475 horse 6nz rebuilt to 550 horse with a bulldog that he keeps turned up so I'm thinking the wear on that might be a factor for problems in the future