NLLex

Hello friends,

I really tried to search in the history of old topics + I tried to find some real user reviews on Google but I can't find very much.

Spritmonitor says the fuel use is more than 9 liter/100km (26mpg) with the 450H and 7 liter/100km (33mpg) with the 300H. Comparing that to the very few reviews on fuel consumption I found online made me decide that I couldn't trust Spritmonitor on this.

I just really would like to know the average use of fuel when driving really chill, no hurry and mixed miles with city and highway.

I hope you guys can help me out.

bclexus

@NLLex - I'd say the rated 31 combined city/highway mpg of 29 city and 34 highway (using 3.2 gallons per 100 miles) is pretty much about what you can count on getting, but I often get 34 mpg in city stop 'n 'go city driving which bumps my combined city/highway mpg closer to 32 or 33 mpg.

This fuel mileage rivals the Toyota Corolla 4-cylinder's combined 35 mpg rating...but the luxury 4,000lb Lexus GS 450h 4-door sedan goes 0-60 mph in just 5.5 seconds and over 100 mph in the ¼ mile whereas the 4-banger Corolla does not come close.

I hope that helps!

NLLex

Thanks for sharing. I was hoping that the consumption was a little bit better then that with the new GS450. Maybe 39mpg combined when driving chill is what I was hoping for.

bclexus

I doubt you'll get 39 mpg combined city/highway driving, but it wouldn't surprise me to get a tad better than 35 mpg combined city/highway driving.

The two detrimental factors that will reduce or influence your best combined fuel mileage the most will likely be the type of city driving you do; e.g. stop 'n go traffic and acceleration that engages on the ICE.

NLLex

There are not many reviews but I saw a few online on other sites which were way higher in fuel consumption but also way lower.... makes me crazy.

bclexus

Yeah, If you're gentle with acceleration and do not care to drive at the posted speed limit or to travel at the speed that other vehicles are going then you'll get your very best mileage.

But you'll have to keep in mind that for the car to charge the traction battery, it requires that the ICE (Internal Combustion Engine) operates - - and the charge from braking of course requires using the brakes due to having more speed than is needed, typically from the ICE being used.

I just hope you're not like many of those people I see driving a Prius that holds up traffic trying to squeeze out .0001 more mpg in fuel economy. Just remember the GS 450h is a 2-ton luxury 4-door performance sport sedan, and is not meant to get the mileage of a horse-drawn buggy.

NLLex

Ok I understand the ICE part.

No not like that Prius driver but we are paying 8 dollar per gallon and that point of 2 euro's per liter was already touched way back in 2014. There is also massive road tax etc so please understand that I like to be a bit creative with choosing the must fuel efficient luxury car when everything is already so expensive....

gripau1

We just came back from a week of Easter getaway and was getting 6.5litres/100km or 38 US MPG. We travelled about 2400km (1500 miles) over the week. Only 2 of us in the car but the boot was fully loaded but I wasn't trailing our motorcycles.

Most of the driving was done on country roads visiting small towns etc, so the speed limit was a maximum of 60-100km/h. Our freeway speed limit is 110km/h and heavily policed so that might contribute to the pretty good fuel economy from the 450h.

NiceWheels

I get about 37mpg in my 2013 450h on long distance trips. 28-30 around town. Driving with the throttle and NOT the cruise control will help mpg in my experience since the car has a chance to recharge and discharge at a slightly varied speed.

bclexus

That is about the mpg I get with my 2018 GS 450h. I do not use cruise control because I prefer to be in full control.

I seldom notice it, but every once in a while I see my traction battery is fully charged.

pcp2117

A significant factor I've found is average trip length. If your trips are all short (20 mins or less), you're going to see worse overall MPG.

The ICE part of the hybrid powertrain takes a few minutes to reach peak efficiency (needs to warm up the catalytic converter, engine/coolant needs to get up to the appropriate temperature), and if you complete your trip shortly after it hits its stride, you won't hit the system's MPG potential. This issue is significantly pronounced in colder weather as the "warmup" period is prolonged. You can mitigate some of this by keeping the car garaged (will keep it warmer) or using a block heater.

bclexus

I keep my vehicles garaged and the temperature remains at 68° or higher. But I've noticed the coolant of the GS 450h reaches normal reading very quickly, much quicker than the GS 350 I had.

I'm told for newer GS450h models, the coolant warms up faster because it has a more sophisticated Exhaust Gas Recirculation (EGR). It’s the routing of exhaust gas to heat up the coolant. It’s actually a different function to EGR, technically it’s EHR.


“The exhaust heat recovery system uses exhaust gas heat to warm the engine coolant at start-up. This obviously shortens the engine’s warm-up time. One effect of this is that the V6 can be shut off by the hybrid controller — if circumstances allow — earlier in a journey, particularly in winter. As a result, the new GS 450h manages a marked increase in cold weather efficiency compared to its predecessor.”