posted on Aug, 16 2008 @ 11:20 PM
reply to post by cautiouslypessimistic
Ten seconds of hard acceleration in any car would lower the mpg for that time period subtantially. If you track your mpg, you WILL notice at
least a +1 or 2 in mpg over the longer distance, which is noticable difference.
You're making statements that you can't back up with the numbers.
I'm going to use my car as an example to prove you wrong. I drive a 2006 Eclipse which according to Cars.com gets 18-23 MPG in the city and 27-30
MPG on the highway. While going 90 mph is very inefficient I'm going to use the high end value of 30MPG just to make the math easier.
I'll drive the short distance and I'll let you take the long distance. We both have a full tank and accelerate at the same rate up to 90mph which
takes 10 seconds. My drive is 30 miles long, which will take 20 minutes (1200 seconds) going 90mph. Since, I get 30MPG on the highway, I will use up
1 gallon of gas during that 30 mile trip. Now, out of the time spent on the road which is 1200 seconds, I am accelerating for 10 seconds. That means
I was accelerating for less than 1% of the time I was using gas. It actually comes out to 0.8%.
I'm going to adjust your mileage a bit and say you continue on for a total of 180 miles. This will take you 2 hours (7200 seconds). Since you also
get 30 MPG on the highway you will use up 6 gallons of gas. Out of the time you spent on the highway which is 7200 seconds, you were accelerating for
10 seconds. That means you accelerated for less than 1% of the time you were using gas as well. It comes out to 0.1% of the time.
The difference between 0.8% and 0.1% is negligible.
You used 6 gallons to my 1 gallon. You said you WILL see at least 2 mpg more. So, by your reasoning, the 5 gallons you used after I stopped means
you should be able to drive an additional 10 miles more than me, just because you didn't have to accelerate a second time. I hope you see how absurd
that sounds. By that rationale, the difference between the city mpg and the highway mpg should be much greater as we are constantly having to
accelerate in the city. But the difference for an Eclipse is 7 MPG from city to highway.
1 acceleration does nothing to affect the distance we will be able to drive.