I think I finally caught up with ISX for a day run!

[Mopar1973Man]

Might work good for highway usage but I also got to figure in dirt road operation too. Slightly softer pressure tend to keeping the tires locked down better on gravel roads. Yes. I will admit I like the slightly high pressure on the highway but I bounce between dirt and pavement so often I got to split the difference.

[AH64ID]

It does make a huge difference. If I am camping for more than a day or two I will drop the rears down, but for short trips I just live with it. For towing I keep the fronts at 75 and rears at 80.

[ISX]

My whole truck weighs 6500. So how a CR packs on another TON is insane. Leather seats lol. I know the 4wd accounts for maybe 150lb transfer case, another ehhh 300 for the axle, if that. Don't see what they are doing to these things to make them so much heavier.

[Mopar1973Man]

Current Today MPG: 24.0

I got a second shot at repeating the same trip. The only thing that changes was weather which was much cooler than the 27.2 MPG run. I travel basically the same run again as the first time.

Vitals I can give...

Cargo and Passengers: 2 on board (350#), groceries (80#), 1/2 Tank of fuel (1/4 tank less fuel)

High Temp Outside: 80*F (25*F colder)

Speed: 55 MPH or lower speed limits never exceeded 55 MPH.

IAT: Forced to 143*F checked actual a few times and it varied from 110-115*F. (22*F to 23*F colder)

Coolant Temp: 193-195*F

Boost: 1.5 to 3 PSI on the flats and tried not to climb much above 10 PSI while climbing grades.

EGT's: (450-500*F down) (550-600*F up) on average max'ed out at 750-800*F climbing 7% grade at 35-40 MPH (not count slowing down for corners acceleration.)

Tire Pressures: Front Axle: 58 PSI - Rear Axle: 40 PSI (+3 PSI more)

Fuel was treated for 128:1 ratio 2 cycle oil.

Air Conditioning was on and used.

Elevation: McCall, ID 5,100 feet approx.

Home: 2,800 Feet measured.

Riggins, ID 1,800 feet approx.

Going up I used 4th Gear all the way from home to McCall, ID then at select times that I could I would use 5th gear on the way down. Same with the Trip to Riggins, ID I used 5th gear selectively and return home I used 4th solely climbing back home.

Repeated as closely as I could.

[Mopar1973Man]

Another update... I'm now down to 21.9 MPG

Vitals I can give...

Cargo and Passengers: 2 on board (350#), groceries (80#), 5/8 Tank of fuel

High Temp Outside: 60*F (20*F colder)

Speed: 55 MPH or lower speed limits never exceeded 55 MPH.

IAT: Forced to 143*F checked actual a few times and it varied from 100-105*F. (10*F colder)

Coolant Temp: 193-195*F

Boost: 1.5 to 3 PSI on the flats and tried not to climb much above 10 PSI while climbing grades.

EGT's: (450-500*F down) (550-600*F up) on average max'ed out at 750-800*F climbing 7% grade at 35-40 MPH (not count slowing down for corners acceleration.)

Tire Pressures: Front Axle: 58 PSI - Rear Axle: 40 PSI

Fuel was treated for 128:1 ratio 2 cycle oil.

Air Conditioning was on and used (Defrosters).

Elevation: McCall, ID 5,100 feet approx.

Home: 2,800 Feet measured.

Riggins, ID 1,800 feet approx.

NOTE: This trip is going to exclude the trip to Riggins, ID so the distance is now for this trip 70 miles.

[Mopar1973Man]

Mopar1973Man Another update... I'm now down to 21.9 MPG

Vitals I can give...

Cargo and Passengers: 2 on board (350#), groceries (80#), 5/8 Tank of fuel

High Temp Outside: 60*F

Speed: 55 MPH or lower speed limits never exceeded 55 MPH.

IAT: Forced to 143*F checked actual a few times and it varied from 100-105*F.

Coolant Temp: 193-195*F

Boost: 1.5 to 3 PSI on the flats and tried not to climb much above 10 PSI while climbing grades.

EGT's: (450-500*F down) (550-600*F up) on average max'ed out at 750-800*F climbing 7% grade at 35-40 MPH (not count slowing down for corners acceleration.)

Tire Pressures: Front Axle: 58 PSI - Rear Axle: 40 PSI

Fuel was treated for 128:1 ratio 2 cycle oil.

Air Conditioning was on and used (Defrosters).

Elevation: McCall, ID 5,100 feet approx.

Home: 2,800 Feet measured.

Riggins, ID 1,800 feet approx.

Vitals I can give... (24.7 MPG)

Cargo and Passengers: 2 on board (350#), groceries (80#), 3/8 Tank of fuel

High Temp Outside: 65*F

Speed: 55 MPH or lower speed limits never exceeded 55 MPH.

IAT: Forced to 143*F checked actual a few times and it varied from 110-115*F. (Winter Front Used!)

Coolant Temp: 195-197*F (Warmer Coolant)

Boost: 1.5 to 3 PSI on the flats and tried not to climb much above 10 PSI while climbing grades.

EGT's: (450-500*F down) (550-600*F up) on average max'ed out at 750-800*F climbing 7% grade at 35-40 MPH (not count slowing down for corners acceleration.)

Tire Pressures: Front Axle: 58 PSI - Rear Axle: 37 PSI

Fuel was treated for 128:1 ratio 2 cycle oil.

Air Conditioning was on and used.

Elevation: McCall, ID 5,100 feet approx.

Home: 2,800 Feet measured.

MPG - Instant MPG number

Cmg - Current MPG for the Day

Tmg - Total For the Tank

IA - IAT Temps (forced)

Yes. My AVG over the tank (Tmg) is really low I've been using the truck mostly for hauling trailers and today was my empty trip for groceries in McCall, ID. But it goes to prove warmer air does produce slightly better quality for MPG's for 2.8 MPG gain...