Lalin

If 15 out of a 30 mile trip are done on EV mode and the average for that trip was 30 mpg, how much fuel did the car actually use?

The apparent answer is half a gallon, but it is not the correct answer. I dont know what it is but based on consistent experience from my daily commute (similar to the above), I would say the amount of fuel used is about a gallon.

Where is the break on the logic?

dopeboy1

Where did you get the 30 mpg figure? Perhaps that is the total including ev.

Donn0128

Remember a cold engine consumes a lot of fuel until it is dully warmed up.

Lalin

From the trip computer which is pretty close to miles divided by gallons. I would say I am +1/-1 mpg computer vs reality.

Lalin

Agreed. During the first couple of miles the car does not engage in EV mode. If it would my average would higher.

getakey

30 mpg is over the 30 mile trip. Thus, you used 1 gallon. if EV was 15 miles, then you got 15 mpg when the gas engine was on.

Lalin

I think you have something there!
But why would the mileage on the engine alone be so bad? 15 mpg on mostly highway is very low.

getakey

it was a short trip
i did not miss anything. Are you sure you got 15 miles of EV? Thats a lot

Lalin

Absolutely sure. Since I bought the car about 5 months/7500 miles ago I consistently do my daily commute with 40 to 50 percent of the miles on EV mode.
It is mostly highway with moderate traffic so it allows me to be in EV mode at around 40 miles per hour.
I also make a point on “forcing” the car to snap from engine to EV.

andysinnh

So I'm reading this and sort of scratching my head as to what the question really is. The average MPG listed in the MID is the miles per gallon of gas achieved since the last time you reset either Trip A or Trip B. I know it's pretty much spot-on since when I fill the tank in my wife's RLX SH that the gallons I put in match what the MPG display indicates to me that it would. If you drive in ICE only mode, the MPG would be much lower. If you drive in mixed ICE/EV modes, it goes up because some times you're using no gas, and that helps raise the MPG value way up for the overall period since the last reset.

In the example shown in the original post, traveling 30 miles and getting an average MPG display of 30 MPG says you'd use 1 gallon for that 30 mile trip. If the EV was running 25 of those miles, it means the 5 miles the ICE was running it was getting really garbage MPG. If 15 of the 30 miles were in EV mode, it means the ICE was getting 15 MPG during that period - which isn't too out of line for a car warming up or in stop/go driving.

Or maybe I'm missing something in the original question...

andy

getakey

Not doubting you, but I've never seen 50% EV unless it was a very short trip like less than 10 miles
I can't see how you are getting such bad mileage (15 mpg) with ICE on highway. At 40 mph, you should be getting >25 mpg with or without EV unless it is very cold. But if it is very cold, you would not be on EV that much as ICE is needed for heater.

Lalin

A few months ago I posted the picture below showing an 18 mile trip and you can see the 50% figure, which was unusually high.
40 to 45% is more common.

Lalin

The MPG I am referring to are ones shown in the trip computer under Current. See photo a couple of posts before.
In the original post I said 15 out 30, not 25 out of 30. I rounded them up to make the math easy as my question was not about the actual mpg, but my flawed logic that getakey clarified.

getakey

39 mpg with 50% EV makes a lot more sense

bmoua15

My logic is simple, I drive my Hybrid exactly how i would drive the latest NSX. So the only time Im in EV mode is in parking lots. Even then I still pull off 23mpg with 60% fwy and 40% street driving.

mrgold35

I'm lean more towards the "Sport" than the "Hybrid" with my MDX. I was around the same mpgs of 22-24 with around 60% hwy (still an improvement of 16-17 mpg with my 11 MDX). Recently moved from the suburbs closer to downtown with 90%-95% city driving now under 50 mph and my mpgs are up to the EPA 26-27 mpg with the same driving habits. I might get between 450-475 miles per tank with +90% city driving.