Subaru B9 Trifecta SUV Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
16 Posts
Discussion Starter · #1 ·
Find this amazing when drive along I-5 South from Los Angeles to San Diego, total about 100 miles.

The observation is the MPG is initially 21, then 20.7 after 30 miles, then 20.4 after another 30 miles, then 20.1 after another 30 miles.

Anyone can explain this? Is it an incidence or just reasonable due to the machanical fatigue?

Many thanks!
 

·
Registered
Joined
·
43 Posts
Hmmm...sounds like the right foot gained a little weight over 100 miles? :D

We've been averaging 24-25mpg highway and we're not afraid of the passing lane ;) . I'd just suggest you enjoy the spirited drive and check your mpg's at the end of the trip.
 

·
Registered
Joined
·
139 Posts
taller said:
not using cruise.
The speed was manually maintained at 70-80 MPH.
Aaaand there you have it. Our rigs get the best mileage AROUND 65mph. More than that, and the wind resistance increases past the point where it's a linear function between speed and mpg.

That said, you're always going to get better mpg when using cruise. The computer measures your speed/rpms something like six times a second, and can react with much finer adjustments to the throttle than even an F1 driver's right foot can.

Long story short, if you want to increase your average mpg over a long trip, set the cruise at a less "spirited" speed :)
 
1 - 5 of 5 Posts
Top