Hi, was looking around last night and came upone this site and thought I would join and see if anyone can help me figure out what to do with my truck. I bought the truck new back in year end of 2004 and previous truck was a 2000 mack vision. Had good success with that truck so figured would trade it for a new one. Well was told the truck should get 6mpg, a little less then what I was getting with the 2000 model, but only way I have gotten close to that is to bobtail. Pulling loads I am 4.5 to 5mpg, depending on weight. So I actually bought a used fld120 with a detroit in it 3 years back and have been driving that and letting the mack sit. I kept the mack because 2yrs left on payments at that point and didn't know how long the freightliner would last, plus I was saving more in fuel then what the two truck payments together were. Anyway the detroit needs an overhaul now so am back to driving the mack. Fuel mileage hasn't gotten any better sitting there. I like look and features of the truck and how quiet it is going down the road but spending $20,000 to $30,000 more in fuel a year doesn't make sense even if the truck is pd for. So has anyone done anything that has improved their mpg? Was seeing some posts about a plate to block the egr sensors and keeping the hot exhaust from going back through the engine again? Or could I just rebuild the detroit and put that into the mack truck so I could get back to the 7-8mpg range? Just trying to figure out some options at this point because being an o/o I need the most efficent truck I can get. I know the cheapest route would be to just rebuild the detroit and put back in the freightliner but that truck is old and noisy and figure since out on the road would be nice to have something quiet to drive and a bit more comfortable. Thanks.
