Here's my per tank mileage numbers:
16. 3 mpg Empty, mostly freeway, 75 mph average
16. 7 " "
18. 3 Pulling 17' boat up steep canyons (100 miles rt) balance freeway empty
16. 7 Empty, mostly freeway. 75 mph average
18. 3 600 lb cargo up steep canyons (200 mi rt) balance freeway empt
16. 8 Empty, freeway, 75 mph
16. 8 Empty, freeway, 75 mph
These records began with around 5000 total miles on the truck. All tanks had close to 500 miles on them. All mpg's are hand calcs.
My signature says 48 RE, but I'm not sure its not a 47. Thought 3Gs all came with 48's.