CAT 450HP engine fuel mileage
I have a friend that claims he gets 10.5 MPG at 75 mph in his 2001 450HP Cat 40Ft beaver PT motorhome and his average is 9.5?? I only get 7.5 in my ISL425 and I only drive 63MPH ? Is this believable...
Forum Discussion
tiffinboy......Mine is a 36' weighing in at about 29000 pounds. I run about 1490 rpm at 59 mph. My Monaco is a rear radiator and I replaced the engine fan with a Source Engineering fan which uses less power and increases HP by 25. I also run a DiGiCr engine chip which has provided a very noticeable increase in mileage. I add OptiLube at every fill up and I drive using my VMSpc computer. I'm constantly watching my instant mpg and change my driving habits as mpg changes, such as wind or hills.
I have a SmartWheel and do 90% of my driving by never touching the throttle pedal as I hate the feel of it. I enter freeway on ramps at a reasonable speed unless traffic requires a faster entry. Once I hit 45 mph on a ramp, I set the cruise and then throttle up a mile per hour every second or two using the SmartWheel. All of my freeway driving is done by thumbing the cruise control up and done with very little use of the throttle pedal.
If I take a short trip to a local park (95) miles away, I only average about 8.5 mpg since there is so much starting and stopping. The long trip we took was literally 6000 miles of highway driving at speed with few stops and starts. I track my mpg via my VMSpc and my wife does it on paper at every fuel stop. On trips that I don't tow where there is a lot of nonstop highway driving I can get 10 mpg.
I've been on this forum for over 8 years and have read a lot about the fuel mileage people get. I would have to say that yours is low for the speeds you're driving. I would question your driving habits. Your mileage is closer to what the people who drive 65-70 mph are getting.
I have a SmartWheel and do 90% of my driving by never touching the throttle pedal as I hate the feel of it. I enter freeway on ramps at a reasonable speed unless traffic requires a faster entry. Once I hit 45 mph on a ramp, I set the cruise and then throttle up a mile per hour every second or two using the SmartWheel. All of my freeway driving is done by thumbing the cruise control up and done with very little use of the throttle pedal.
If I take a short trip to a local park (95) miles away, I only average about 8.5 mpg since there is so much starting and stopping. The long trip we took was literally 6000 miles of highway driving at speed with few stops and starts. I track my mpg via my VMSpc and my wife does it on paper at every fuel stop. On trips that I don't tow where there is a lot of nonstop highway driving I can get 10 mpg.
I've been on this forum for over 8 years and have read a lot about the fuel mileage people get. I would have to say that yours is low for the speeds you're driving. I would question your driving habits. Your mileage is closer to what the people who drive 65-70 mph are getting.
