Duramax L5P Fuel Mileage
Anyone have any real world experience with the fuel economy of the new GM L5P Duramax in a 3500 DRW?
Forum Discussion
Comparison is against self. The percent change from solo to towing.
1). Set aside a day. Head out to nearest Interstate fuel stop. Top fuel to first auto shut. Tires at lowest per chart. Nothing in truck. Scale it.
2). 100+ miles outbound and then back to same pump. Top off same way.
3). 100% cruise control at 58/9-mph. (No, not 63 as the aerodynamic wall is dead on 60).
4). Ideal trip is only two accel and two decel events with no lane changes.
This (like getting a TARE weight) is a baseline for all that comes in the future.
Guys getting 17-18/hwy SOLO are cracking me up. I hit 17 Towing my 35’ TT.
Mechanical condition and future diagnosis of problems needs a baseline of numbers.
The PERCENTAGE CHANGE from solo to Towing is predicated on same tow vehicle sans trailer, same roads & speed
OP you’ll find none of the respondents or others you ask will ever have made a comparison worth quoting. Speeds, loads, etc, are ignored. And wrong tire pressures are used. Do your own testing.
The same test as above with the truck loaded for camping (simulate passenger load) AND yet another when hitched (max propane & water ) AT THE SAME SPEED AS ABOVE
Will give you the Scale Info and tire pressure data you NEED to make good decisions. . Changes in mpg are idiot lights. What’s wrong?
The final result is being able to predict vacation fuel costs while towing. At today’s prices I can use Fuel Cost = 17-cpm (cents per mile).
Step One is in finding “best” highway mpg. Solo empty. Solo loaded and then towing.
Use FUELLY or similar to trend.
.
1). Set aside a day. Head out to nearest Interstate fuel stop. Top fuel to first auto shut. Tires at lowest per chart. Nothing in truck. Scale it.
2). 100+ miles outbound and then back to same pump. Top off same way.
3). 100% cruise control at 58/9-mph. (No, not 63 as the aerodynamic wall is dead on 60).
4). Ideal trip is only two accel and two decel events with no lane changes.
This (like getting a TARE weight) is a baseline for all that comes in the future.
Guys getting 17-18/hwy SOLO are cracking me up. I hit 17 Towing my 35’ TT.
Mechanical condition and future diagnosis of problems needs a baseline of numbers.
The PERCENTAGE CHANGE from solo to Towing is predicated on same tow vehicle sans trailer, same roads & speed
OP you’ll find none of the respondents or others you ask will ever have made a comparison worth quoting. Speeds, loads, etc, are ignored. And wrong tire pressures are used. Do your own testing.
The same test as above with the truck loaded for camping (simulate passenger load) AND yet another when hitched (max propane & water ) AT THE SAME SPEED AS ABOVE
Will give you the Scale Info and tire pressure data you NEED to make good decisions. . Changes in mpg are idiot lights. What’s wrong?
The final result is being able to predict vacation fuel costs while towing. At today’s prices I can use Fuel Cost = 17-cpm (cents per mile).
Step One is in finding “best” highway mpg. Solo empty. Solo loaded and then towing.
Use FUELLY or similar to trend.
.
