Underrated gas mileage - Elantra Value Edition - Hyundai Forums : Hyundai Forum
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post #1 of 53 (permalink) Old 12-27-2016, 01:25 PM Thread Starter
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Underrated gas mileage - Elantra Value Edition

I just did my 1st refueling - 36.3 mpg (gauge read 39.3mpg). I drove it relatively easy since it is a new car, but regardless, i'm very impressed. My commute is 50/50 highway city - and the city driving is a lot of stop and go (<10mph creeping). My prior gen 2011 Elantra would get about 31-32mpg under the same conditions and it technically was rated higher at 28/38 compared to 28/37 on the new model. Nice to know that real world gas mileage is much improved.
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post #2 of 53 (permalink) Old 12-27-2016, 01:40 PM
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I was hoping the trip computer's estimated MPG was accurate. So you calculated the MPG yourself and it did not match the gauge?
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post #3 of 53 (permalink) Old 12-27-2016, 02:37 PM
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I haven't drove mine more than 50 miles in the past month due to several issues, but I haven't gotten over 32mpg yet on 99% highway driving. I have the limited with the oversized rims though.
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post #4 of 53 (permalink) Old 12-27-2016, 02:53 PM Thread Starter
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Originally Posted by josephclemente View Post
I was hoping the trip computer's estimated MPG was accurate. So you calculated the MPG yourself and it did not match the gauge?
Yes, taking miles (425) and dividing by gallons (11.7) I got 36.3mpg. Of course, I'll need to repeat this to confirm the results are accurate, but I feel confident in the numbers. I have put about 30 miles on the new tank and gauge is reading 44.9mpg, so hoping that's 41-42mpg. Traffic this morning was virtually absent so almost no stops/idling.
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post #5 of 53 (permalink) Old 12-27-2016, 03:20 PM
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My gauge in the car reads about 3 or so mpg than what I measure at the pump, but I have had other cars the same way. Last time i filled up I got about 35.5 but this was lower than I have had. I think the cold winter weather has caused a drop because I was getting 37/38 during a mild November.


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post #6 of 53 (permalink) Old 12-27-2016, 03:21 PM
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Originally Posted by Jonathan Wylie View Post
My gauge in the car reads about 3 or so mpg than what I measure at the pump, but I have had other cars the same way. Last time i filled up I got about 35.5 but this was lower than I have had. I think the cold winter weather has caused a drop because I was getting 37/38 during a mild November.


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post #7 of 53 (permalink) Old 12-27-2016, 04:29 PM
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Originally Posted by LoeCraw View Post
Yes, taking miles (425) and dividing by gallons (11.7) I got 36.3mpg. Of course, I'll need to repeat this to confirm the results are accurate, but I feel confident in the numbers. I have put about 30 miles on the new tank and gauge is reading 44.9mpg, so hoping that's 41-42mpg. Traffic this morning was virtually absent so almost no stops/idling.
You use the rated volume rather the pump measurement?
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post #8 of 53 (permalink) Old 12-27-2016, 05:32 PM
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I took my first road trip (125 miles round trip) yesterday in my new VE. 500 miles on the odometer. Ran in ECO mode, about 90% highway. Gas mileage reading on the dash said 43.1 MPG. Started out with a one "click" fill up before the trip, then went to the same pump, same one "click" fill up on my return. The actual calculated MPG was 42.9 MPG. I was quite surprised by how efficient this car is, and also surprised how accurate the on board computer MPG was as well. SUPER happy camper with this kind of gas mileage. And, BTW, been getting consistently 33 MPG or so in city driving as well! Color me happy!
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post #9 of 53 (permalink) Old 12-28-2016, 04:20 AM
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Fuel computer on my Limited does not show gallons used, have to do this myself, reset trip B to zero after a fillup, then go to that window that shows miles remaining an average mpg since last fillup.

Say I drove 289 miles and divided that by 44.2 average miles per gallon, this is 6.54 gallons, and this is exactly what the pump would say after it clicked off. But this was last summer and part of the fall.

Don't even want to do this now with this stupid winter gas, price is the same, but paying for added air in the gas. EPA demands this because they claim it takes longer for the engine to warm up and reach operating temperature, what about a minute or two? Emissions are worthless until our engines reaches normal operating temperature. In general the fuel on the pump is about 20-25% more than the calculated value during this time of the year.

The two key parameters in determining mpg are the pulses from the Vss sensor and the average injector dwell, but based on a fuel with a heating value of 120,000 BTU's per gallon for what we call summer gas. Winter gas can be as low as 93,000 BTU's per gallon or maybe even lower that is this huge difference. Same volume but a lot less energy. I know my my pump is accurate, filled up my two gallon gas can to the fill line, said exactly 2.0 gallons, so this is not problem.

No complaints about paying my natural gas bill, charged by the number of therms I use, 100,000 BTU's, but with car gas, based on volume of the fuel with a heck of a lot less heating fuel.

So far no proof that this oxygenated gas is reducing emissions, based on theory, just like banning R-12, so now just fill the tank, don't want to read it, tees me off. Since we live out in the sticks, were the last to get this crappy gas. Would have no complains if we were paying for the heating value of fuel, not for the volume of it. Just fill the tank and try to forget about it, don't like to know we are getting robbed.
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post #10 of 53 (permalink) Old 12-28-2016, 06:51 AM
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Just fill the tank and try to forget about it, don't like to know we are getting robbed.
This, pretty much, describes me, Nick.

On the 2011, I was obsessed with the mpg. It was a game I played. And there were times it made no sense, whatsoever. How high can I make it go? And under what conditions does it operate at peak economy?

Then I bought the 2013. Found myself not so controlled by "hitting the marks." Then I bought the current 2017 and can honestly say, "I don't really think about it." I did, initially...when the car was brand-spanking new and I did a 2,600 mile road trip. It was fun to crunch the numbers, play the fuel-sipping game...observe the entire operation full out, over a variety of terrains and road conditions. But now? I'm content to fill the tank and drive away. When it needs more pushmahol, I fill her back up and go some more. Life's so much simpler using this approach.

How should I say this: "I'm checking it less and enjoying it more?"

Okie Rich
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