down hill, 55-60, don't try to keep constant speed or accelerate on inclines, etc. in other words, hypermiling?

but nothing to do with ev's.

 

ok thanks, I found a good video on YouTube for changing plugs. But having a bit of issues sourcing plugs etc, locally we only have a Toyota. Could I in theory just purchase plugs, intake manifold and throttle body gasket for a 17 highlander?

I’ve also seen guys on here recommend lexuspartsdirect.ca but shipping seems pretty high

Thanks!

 

thanks for the reply

yes it does seem to shift weird/poor acceleration.

i will try off eco, it has been a bit cold here but not too crazy. I usually only idle for a few minutes

I will look into above thanks again!

 

I've gotten 28.x before in wife's RX, highest I remember.

 

I can't believe the mileage some of you guys get! I thought I drove like a total grandpa and I'm maxing out around 27 with an average closer to 25.

My theory is that the car isn't very efficient at 70-80mph (my local highway speed) but quite efficient at the 45-55mph range.

 

Keep in mind people maybe claiming city, highway or a mixture, not everyone states details.
I regularly get 19 mpg driving in metro areas and 29 mpg on highways, that's at 70 mph

 

The three biggest things that impact MPG are

1. The route you take

If traveling in the city, do not expect more than 22 MPG because of stop and go traffic.

2. How hard you are on the gas pedal

When your pressing more on the gas pedal, your engine needs more gas to produce more acceleration. Just apply enough to drive steady and go with flow of traffic. Avoid overtaking.

3. The wind direction

Ever rode a bike facing in direction of the wind? It's the same for a car. If traveling in the direction of the wind(10mph+) at freeway speeds, do not expect to get more than 23mpg. Engine needs more gas to produce the same speed with a headwind. You can see direction of the wind in the weather app in the infotainment panel.

With a tailwind, you can get 30+ MPG at 60MPG freeway speed. There is less wind in the evening and night time than during the day,

With the above 3 tips, I'm consistently able to average 25-28mpg on my 2017 RX 250 (with AC ON). My highest was 31MPG on a 8mile trip going to work with a tailwind.

I've found things like tire pressure (unless its below 25PSI), hyper-miling (very unsafe) and the grade of gas you use doesn't matter that much.

 

I'm getting 24.5, 75% highway driving.

 

Since the pandemic, I've been getting wildly divergent mileage numbers from 2 separate vehicles: 1) 2017 Lexus Rx, 2) 2008 Chevy Cobalt.

I noticed it first in the Cobalt and thought IT might be the issue. Then I noticed the same issue in the RX.

With exactly the same driving habits in exactly the same place, I'm getting a range of 20-33% less-than-normal-mileage in both cars when the problem happens. The best mileage I usually get (see exception below) is the normal mileage I was getting prior to noticing this issue.

It makes me wonder if all the supply chain issues during the pandemic had some effect on the gas refining process or delivery process.

I've tried to stick to big-brand name gas, like Mobil. And I've also started getting higher-octane gas just to see if it had an effect (it did-10-20% better mileage, when it works).

But recently I got Mobil Supreme in the cobalt, and my overall mileage dropped to 21 mpg. My prior fillup, with Race Trac's highest grade, boosted the Cobalt's mileage to the highest I've ever seen in that car - 36 mpg.

I know 2 vehicles is a small sample size, but at this point I'm convinced that SOMETHING is going on with gas.

Any input appreciated.

 

Finally got around to doing this after noticing my fillup frequency didn't quite jibe with the numbers the RX was reporting.

And I was correct -- after manually checking MPG by comparing amount of gas used vs. miles travelled, the RX is OVERSTATING mileage by 13%.
So, that 33 mpg I reported back in Oct 22, is actually more like 28.7. Still not terrible...but disappointing to discover.

 

I still think the way computer generates is accurate.
when you do manually fill-ups, there is still residual gas left which you are not taking into account.

when I fill up my tank, sometime the miles range will say 313, or 326, or even 358. so when you fill up your tank, you actually might not be filling it all the way up. It has to do with how the gas nozzle detects gas vapor in your tank.

 

Hmmm...seems like simple math: miles traveled / gas used (assuming the tripmeter/odometer is accurate). The difference in fillup amount can't be THAT different each fillup .

Though if it is, it should average out over time. So, I should probably have a larger sample size than 1.

 

I've always done it manually my whole life. So I always know exactly what mileage I'm getting.

 

There's more to the calculated range than just the detected fuel level after fill-up. The owner's manual says this about the displayed range: "This distance is computed based on your average fuel consumption. As a result, the actual distance that can be driven may differ from that displayed." It does not say over what period the average is calculated, i.e. since reset, since refuel, since engine start. Anecdotally, it seems to be calculated over a recent period. When I've been getting better recent mileage (flat, relatively slow, few stops) the calculated range after a fill-up is always on the high side. Lower recent mileage (hilly, heavy, fast, lots of stops) yields a lower predicted range.

I did a long term (25 fill-ups) mileage test that I've previously posted. During that I noticed the indicated mileage could differ from the manually calculated mileage by +/- 1.1 mpg for a single fill-up. Over the life of the test, though, indicated and calculated mileage was within .1 mpg.

 

My Rx uses 20" tires set at 33psi. I always use AC and Normal mode .80% interstate driving usually 15-20 over speed limit and get 23-24 mog.City driving normal speed about same. oil change and air filter every cc 5K