Im2bz2p345

The most that I've gotten is 33 on a very flat/somewhat downward sloping highway in TX in the summer. That's what I was being quite conscious about my pedal position and efficiency gauge.

Nowadays, I usually average around 28 mpg since most of my commute is city and a shorter distance. I have 18" oem tires with stock Michelin Primacy tires. I have my tires inflated a tad higher than usual too - maybe 36/37 psi if that makes a difference.

There are so many variables to gas efficiency, so I wouldn't be surprised if a larger tire caused a difference. Anyway, hope this helps.

~ Im2bz2p345

Tom450

I wanted to see what steady speed gave the best MPG. Using sport mode so the tac is visible I found that the 450 defaults to a RPM of about 1100 regardless of the CONSTANT speed until you hit 55mph. The listed MPG is over 40 using the graphs. As soon as the MPH goes over 55 the RPM increases and the MPG decreases. It appears that the CVT uses the gearing that gives the most efficient MPG. Your actual MPG will of course vary depending on your driving style but I would expect if you can drive with cruise control at a constant 55mph you will get over 40MPG!!!

Deven

Thanks, I will try 55mph on cruise control this weekend and experiment some more.

Chilton88

I drive in a very hill heavy highway and back roads. I get 30.3mpg, but I also have barely 1000 miles on the car...so it's still breaking in.

1fuzzybk

I'm experimenting with milage too. The biggest difference I have see is in relation outside temperature. In the dead of winter the car is colder and the battery does not move much power when cold.

Fuel grade did nothing. Went from 91 to 85 (I'm in Denver) and didn't see any drop. using fuel that's $.40 a gallon. I will try premium this Summer for a few tanks and see if that changes anything.

I got a 1.5MPG increase trying to get the engine running as soon as possible when accelerating from a stop light in traffic rather then trying to do the first 50' on battery only. It's the opposite effect you would think it would have but it works. I figure it's keeping the engine at a lower RPM and using the battery rather than needing more power from engine after I'm lagging behind and having to ketch up.

Mind you if my commute was longer then 7.5 miles (all city) each way my mileage would be better. I don' reach full temp until 2/3 of the way to work and the engine will not shut off even at stops before 1/3 of the commute.

Another note, is this the Lie-O-Meter in the car or hand calculating the mileage? My car always says I'm getting 1-2.5 miles per gallon better then what it calculates out too.

chromedome

Slightly off topic as I have an ES hybrid instead of the GS but using engine acceleration for better mpg is a good idea. That's what I do, accelerate on engine power at 2000+ rpm and then lift off to cruise on battery. You can extend this further by using pulse and glide, where you accelerate using the engine and coast on battery, letting speed slowly drop until you accelerate again on engine power. I'm getting 45 mpg in town using this technique.