Last post on Nov 29, 2013 at 3:12 PM
You are in the Hyundai Elantra
What is this discussion about?
Hyundai Elantra, Fuel Efficiency (MPG), Hatchback, Sedan
#21 of 774 Re: mpg on a recent 400 mile roundtrip [g2iowa]
Nov 26, 2011 (10:01 am)
i started with 10 gallons of gas so i could do a more accurate mpg reading.i filled up near to where i live then headed up to orlando.i reset my odometer then started the drive.car was bone empty when i filled it up with 10 gallons of gas.this is a very easy calculation so you do the math..440 miles total driven before car needed to be filled up again.440 miles divided by 10 gallons of gas=44 miles per gallon.these calculations are based on about 90% highway driveing.by the way,the trip computer in the car was very accurate.
#22 of 774 Re: mpg on a recent 400 mile roundtrip [steven39]
Nov 26, 2011 (12:11 pm)
Steve you reported 46mpg in your previous post about this trip. Now it's 44mpg.
Which was it?
#23 of 774 Re: mpg on a recent 400 mile roundtrip [dodgeman07]
Nov 26, 2011 (4:44 pm)
it's 44,my mistake..i'll be takeing another road trip up there around christmas time so i'll report my mpg once again from that trip....
#24 of 774 Re: mpg on a recent 400 mile roundtrip [steven39]
Nov 26, 2011 (5:52 pm)
I don't own an Elantra nor am I affliated with Hyundai in any way. No horse in this race. Here is what I verify if having mileage problems:
1. Quality of fuel (85 vs. 87 vs. 89 octane | 10% ethanol or no ethanol)
2. Vehicle load (your total vehicle weight vs. dry curb weight)
3. Tire pressure (cold tire pressure at 33-35 psi)
4. Driving speed and acceleration (at speed limit and engine revs)
5. Driving conditions (wind, hills/mountains, heavy traffic. etc.)
87 octane, no ethanol fuel runs best for me. I buy name-brand fuel when I can. I keep my vehicle weight to a minimum - nothing unneeded in the trunk or passenger cabin. I set my cold tire pressure at, or a touch above, the manufacturer's recommended psi. If I drive over the speed limit or rev the engine a lot, I expect a mileage penalty. Hilly terrrain and heavy traffic reduce my mileage up to 30%.
Best of luck!
#25 of 774 Re: mpg on a recent 400 mile roundtrip [dodgeman07]
Nov 26, 2011 (6:44 pm)
I agree on what your saying. The only thing that I do different is instead of "air" in my tires, I use nitrogen. The hot and cold temps. that everyone has doesn't effect the tire prssure like air does. Air increases with heat, but loses in the cold, or shall we say the air molecules expand an contract acording to temp. an driving conditions. It use to drive me nuts in the winter with air and you car has the TPMS. If it goes below 25.7 PSI, the TPMS light comes on, especially if you don't drive it everyday or 2. Just my 2 cents.
#26 of 774 Re: mpg on a recent 400 mile roundtrip [steven39]
Nov 27, 2011 (4:59 am)
I am confused about your method of calculating mpg. My reading of this is the gas you used to drive 440 miles was 10 gallons to refill at the end of your trip plus the amount of gas used to fill your tank from 10 gallons to full at the beginning of your trip. Please be more specific about your methods if my analysis of your method is incorrrect. I cannnot see how you measured starting with 10 gallons in your tank and how you ran your car to bone dry (not possible).
#27 of 774 Re: Method--Mpg on 400 mile roundtrip [steven39]
Nov 27, 2011 (7:42 am)
You lost me on your methodology. I'd have no idea how I'd ever know my tank had exactly 10 gals of fuel in it unless I ran out of gas and then added 10 gals. But running out of gas is a very bad thing to do anymore to modern cars. [Not sure I've seen anything in the manual on the "reserve". Many models have the low fuel light kick in at 1.5 or 2 gals left in tank. So if you added 10 gals when low fuel light kicked in you may actually have as much as 12 gals in tank.] Thinking the way most people do the actual fuel used method is to fill the tank up until the gas pump auto-shut off kicks in. Then stop. Reset trip odo to 0. Drive your distance. Refuel tank from same pump and fuel till auto-shut off kicks in. Then divide miles driven by gals added. This gives the best way to approximate actual fuel economy achieved for that one tank.
#28 of 774 Re: Method--Mpg on 400 mile roundtrip [g2iowa]
Nov 27, 2011 (8:26 am)
i find myself haveing to repeat this over and over to make you understand annoying.so hear i go again...read my lips people.........I FILLED UP MY GAS TANK BEFORE STARTING OUT ON MY TRIP WHICH WAS EMPTY WITH THE FUEL LIGHT ON...I PUT IN THE TANK ACCORDING TO THE GAS PUMP AT THE STATION WITH EXACTLY 10 GALLONS OF FUEL.I THEN RESET MY ODOMETER TO 0 AND BEGAN MY JOURNEY.WHEN I GOT BACK HOME ON THE SAME TANK I LEFT WITH THE TRIP ODOMETER SAID 440 MILES AND THE GAS TANK WAS EMPTY.440 MILES DIVIDED BY 10 GALLONS OF GAS=44 MILES PER GALLON..WHAT PART OF THIS EQUATION ARE YOU CONFUSED WITH??..WITH ALL DO-RESPECT IT IS SIMPLE MATH...THANKS.....
#29 of 774 Re: Method--Mpg on 400 mile roundtrip [steven39]
Nov 27, 2011 (8:40 am)
Unfortunately you're not using an accurate method of measurement as you can't say with precision how much gas was in the tank before you added the initial 10 gallons.
The generally accepted way to measure fuel economy is to fill up the tank until it's full. Don't overfill/top off. Write down your odometer reading. Then go on your trip. When you need to refuel or when you're done with the trip, fill up again. Now, take the miles driven (current odometer reading - the reading you wrote down) and divide it by the number of gallons it took to fill up at the end of the trip. That provides an easy & accurate fuel economy numbers that a consumer can get.
#30 of 774 Re: Method--Mpg on 400 mile roundtrip [fushigi]
Nov 27, 2011 (8:45 am)
i'll keep that in mind when i do my next road trip,thanks for the info....