# How does this effect gas mileage?

@reinydawn (11649)
United States
May 9, 2007 9:17am CST
I have always noticed this and sometimes I just wonder about it. When I fill up my gas tank, the first half tank gets me about 200 miles, but I only get a little over 300 miles on the whole tank. If you do the math, I should get 400 miles on the whole tank. Why does the first half tank always get more miles? I need to do a test and see if I'm actually getting better gas mileage on that first half tank... Does anybody out there know???
3 responses
@JKostura (107)
• United States
20 Feb 08
Ha you read my mind! I was thinking the same thing today. It seems to takes a long time before that little arrow moves off the full line but once it does, watch out! Just an illusion I suppose. Of course, what do I know. I know absolutly nothing about cars except you put gas in it to make it go! LOL
1 person likes this
@reinydawn (11649)
• United States
20 Feb 08
Yup, that's about how I am too. I can put windshield wiper fluid in it too, but I usually make a mess :)
• United States
11 May 07
Let me see???? Who was it??? Was it a presidential candidate??? I just can't quite remember??? The words were "fuzzy math"..... ~Donna
1 person likes this
@reinydawn (11649)
• United States
11 May 07
Hey, that's kinda what I thought too... Now, I know math, it's just the car I don't know!!!
@ebsharer (5517)
• United States
10 May 07
your gas tank is not one size all the way. it is normaly larger on the bottom and gets smaller on top. you don't get better miliage on the top or bottom its all the same. to figure out the miles per gallon. you have to know how big your tank is for example my gas tank is 13 gallons so you take 13 divided by 260 miles makes 20 miles to the gallon.
1 person likes this
@reinydawn (11649)
• United States
10 May 07
hmmm... I didn't realize it wasn't just a big cylander (sorry, I have no idea how to spell that...) I figure my gas mileage all the time. I set my trip counter every time I fill up, and I always fill the whole way up. So I know how many miles I've gone on how much gas, divide it and I've got my mileage. Just never knew why the trip counter always went faster with the less gas I had. Thanks!