Ok it took me 2 hours to find a spread sheet program, learn how to program the columns and put in my Numbers but here they are. Tell me what you think.

Some notes:

10 Mar and 14 Mar are wrong due to me being in a hurry and not filling the car totally up the one day. DIdnt realize it till next time I filled up.This is the only time it wasnt a fill to click type thing. So those 2 days are wrong. The others are correct. I sued to fill to even numbers then someone said it makes me tracking slightly off. So after the first change of oil, all filling was to the first click.

I installed the Supercharger on 2 DEC and they changed the oil.
Normal Oil Change on16 FEB and 29 APR

You can see I think its 3 long trips.
17-19 Nov, 21-22 Jan, 1-2 Apr. These are ALL Highway miles with cruise set. Not to bad for 18" Wheels and a supercharger.

Premium fuel used since day 1.

 

i've actually had a steady decline in mileage leading up to my 2nd oil change (which im taking it in for in about a week). i averaged between 26 and 30 mpg, but in the last 6 or 7 tanks (quite a while actually) its been getting between 21-25 despite there being no change in my driving habits.

 

I keep track of my milage using excel also. Although I don't record the price. But what you can see from your spreadsheet is a steady increase in gas prices.

I'm averaging 26 MPG.
I'm averaging 292 miles per tank.
I'm averaging 11.318 gallons per fill up (I usually fill up just before the light comes on).

Lately I've been granny shifting (2.5K) and I've noticed my MPG going up by several MPG. It takes me a lot of will power not to get on it, but in the end, it saves me money.

 

Very informative! The biggest mpg change for me was highway versus city travel and the long trips you've taken seem to reflect that too.

 

I have tried going a tank of not breaking 3000RPMS. ITS IMPOSSIBLE. I have tried so hard, but I feel like I am shifting so much leaving a light.

Its a huge difference from city to highway. About 7 MPG for me.

 

i'm not sure why you would waste money on using premium in a non-supercharged car. now that it's supercharged, you have to. however, when it wasn't, it will give you zero benefit to running smoother, better gas mileage, and more power.

 

i try to shift below 3000 and try driving w/ less foot pressure on the gas.. but DAMN! its not possible for me too!

i've tried the past 3 gas fills. lol ~ everytime it hits the first tick (3/4 gas left) it reads about 70ish >:O

 

i average about 27 mpg...60/40 (highway/city). the way you drive also changes mpg.
i got less mpg when i got my exhaust cuz i accelrator a bit harder.

 

I got the supercharger a 2 months after owning. It I started with premium because I wanted to get the supercharger the day I owned it a new I had to have premium in it as soon as it was installed. But wasnt sure when they would get it. I wasnt going to lose a full tank of gas to be drained just to put premium in it. So i just used it from the get go.

The difference in gas price isnt that huge to hurt for those fill ups. I filled up 7 times before the charger. Premium is .20 more a gallon. Thats 2.40 a tank. so 16.80 is what I used. Thats less than if they had of had to drain a full tank of regular.

 

The additives in gasoline have changed recently as well. MTBE has been replaced with Ethanol, which will yield slightly worse fuel economy.

 

I have the supercharger and average 25 mpg in a mix of hwy and city driving. I was very pleased on a recent, all highway trip, where cruise was set at 74 mph the whole trip of 305 miles and I achieved 30 mpg.

And I didn't buy the supercharger to accelerate like a grandma to save gas, so I say to heck with it and just pay to have fun, lol.

 

Yeah I really am not dissapointed either. I think the people that complain about the premium gas need to realize that 20 cents a gallon and a fill up a week equates to, $8 a month. If someone cant afford $8 a month, they probably should be buying a part for $3500+/- installed.

Like you said you pay to have fun.

 

I work at Sears Auto Center and we have the fuel system cleaners. I improved 7 mpg. PM me for details