This is a cool app, it does what it says it will do. I like the scale on the home screen a lot. The sounds take some getting used to, but they will help you drive differently. Will update review when I get some more mpg data.

This app is designed to help you avoid hard acceleration and braking whenever possible. In tests, frequent bursts of acceleration and braking reduce the fuel efficiancy by 2 to 3 mpg. Once up to speed on the highway, maintain a steady pace in top gear. Smooth acceleration, cornering, and braking also extend the life of the engine, transmission, brakes, and tires.

I do not use any extras on this app, just the color scale. I am used to calculate my mpg manually, do it every time I fill up. But just by using the app in most primitive way, I changed my driving style so my average mileage increased to 33mpg from 30mpg on my Mazda3i. Great job! saves me a gallon per week; my "investment"in the app returned after first tank.

Could use an update including a how to for the slower ppl like the ones that reviewed before this, and a way to adjust sensitivity (all cars drive diff). Maybe have all the specs of other cars and trucks uploaded and you just select your whip. The price is a bit high, its worth about .99. Wait for an update or a price drop.

Am I missing something here? It doesn't come with directions or what the he'll you're supposed to do other than enter your odometer and put the name of your car in. Yeah there is a fancy meter on your screen and it goes up and down... But it doesnt tell you why or what it's doing!? I suggest they add a " how to" or atleast some sort of simple directions.. Jeez

This looks better than a lot of the other MPG-tracking apps, but it's seriously lacking in functionality (unless I'm missing something). I keep my odometer set to "trip", resetting between fill-ups, rather than total mileage. I guess I could switch back and forth to enter data, but that's just an extra step. Please add a "trip" option. I also find cost per gallon more useful than total cost. And is there really no ability to edit or review individual entries? This application has a long way to go before I start using it.

Expected better performance. I live in a more rural area and because the roads I drive are a little rougher than most this app wasn't helpful at all. Probly be a better purchase for highway drivers.

when i open this app it mutes itunes... a necessity when i'm driving. so i couldn't use it to "save the world" and improve my mpg. i also couldn't input any data for my vehicle from the past. there are much better apps to keep track of mileage and maintenance records. i should have done more research before buying.

I turned the sound off so I could listen to my music while I drive, but the display gives good visual feedback while I drive. I used to calculate my mileage after each tank using the trip odometer, but the stats are a convienient way to keep track.

Doesn't read properly and way over priced.

It does everything it says it does.. But really, you are forced to drive like an 80 year old leaving bingo. I would not purchase this for even 99cents