SQLite

I am using SQLite for a web + Android app that will track and map my MPGs.

Schema

log

id key
date datetime
odometer decimal(7,1) 
mileage decimal(5,1) distance traveled since last fillup
gallons decimal(5,3)
price decimal(6,3) price per gallon
cost decimal(6,2) total purchase
lat text
lon text
comment text ex: gas station name and address

journal

id key
date datetime
odometer decimal(7,1) 
weight int(11)
comment text

trip

id key
date datetime
start decimal(7,1)
stop decimal(7,1)
comment text

Reports

Calculated

mpg
average mpg