Doctor CAD
Well-Known Member
I bought a OBD2 bluetooth signal sending unit and have a software called HOBDrive on my IPAQ.
I have been keeping track of MPG with it for the past 3 tanks of gasoline. My commute is 8 3/4 miles one way, the roads vary from 45 mph 2 lane to a short stretch of 4 lane 55 mph to stop and go for a mile. I have averaged 18.6.
Over the past weekend, I drove across NC and SC to attend a BBQ festival. On the way there, I did not reset the MPG value and I was showing 19.8 to 19.9 as an average. I filled up and reset the gauge for the trip home. 244 miles of total highway driving. The first 45 miles is 2/4 lane 55 mph rural highway, the second part is 70 mph interstate in SC and the last 45 miles is 65 mph in NC.
I am a +5 to a +8 mph driver (55 = 60 to 63) (65 = 65 to 68) (70 = 73 to 74 because the truck just doesn't like to go much faster than that for long stretches comfortably).
On the 55 mph trek (60 to 63 mph) I was 21.4 mpg, on the 70 mph trek (73 to 74) I was at 20.0 and with the last 65 mph bit, I ended up with a total of 20.3 MPG. Thats with 2 adults and luggage.
I have no roof rack and I am XCal 2'ed to a 87 torque tune (by Torrie).
Looks like the sweet spot would be around 65 mph, but who can keep that up!
OK, now for the question... One of the reported sensors is collant temperature. On the trip, I was seeing 199 degrees for all 4 hours of the trip. I would really like to see that drop to 190 or less with all the airflow over that radiator at highway speeds.
Does it seem like time to change the thermostat and coolant or is that temperature "normal"?
I am going to retune to the 87 economy tune and keep track of MPG's that way for a while, but i really hate not having lots of power and neck-snapping shifts!
I have been keeping track of MPG with it for the past 3 tanks of gasoline. My commute is 8 3/4 miles one way, the roads vary from 45 mph 2 lane to a short stretch of 4 lane 55 mph to stop and go for a mile. I have averaged 18.6.
Over the past weekend, I drove across NC and SC to attend a BBQ festival. On the way there, I did not reset the MPG value and I was showing 19.8 to 19.9 as an average. I filled up and reset the gauge for the trip home. 244 miles of total highway driving. The first 45 miles is 2/4 lane 55 mph rural highway, the second part is 70 mph interstate in SC and the last 45 miles is 65 mph in NC.
I am a +5 to a +8 mph driver (55 = 60 to 63) (65 = 65 to 68) (70 = 73 to 74 because the truck just doesn't like to go much faster than that for long stretches comfortably).
On the 55 mph trek (60 to 63 mph) I was 21.4 mpg, on the 70 mph trek (73 to 74) I was at 20.0 and with the last 65 mph bit, I ended up with a total of 20.3 MPG. Thats with 2 adults and luggage.
I have no roof rack and I am XCal 2'ed to a 87 torque tune (by Torrie).
Looks like the sweet spot would be around 65 mph, but who can keep that up!
OK, now for the question... One of the reported sensors is collant temperature. On the trip, I was seeing 199 degrees for all 4 hours of the trip. I would really like to see that drop to 190 or less with all the airflow over that radiator at highway speeds.
Does it seem like time to change the thermostat and coolant or is that temperature "normal"?
I am going to retune to the 87 economy tune and keep track of MPG's that way for a while, but i really hate not having lots of power and neck-snapping shifts!