Fuel Savings Vs Speed Calculator Aggressive City Driving Vs.
Relaxed City Driving  
Highway Miles (Per Day): 50 City Miles (Per Day): 50
Gas Price (per Gallon): $3.00 Gas Price (Per Gallon): $3.00
Car Highway MPG Rating: 30 Your Car City MPG Rating: 25
Speed Total Travel Time Per Day Cost/Day Cost/Month Cost/Yr Type Total Travel Time Per Day Cost/Day Cost/Month Cost/Yr
55 MPH 55 minutes $5.00 $150 $1,800 Relaxed 94 minutes $6.00 $180 $2,160
60 MPH 50 minutes $5.45 $164 $1,964 Heavy Foot 86 minutes $10.20 $306 $3,672
65 MPH 46 minutes $6.00 $180 $2,160
70 MPH 43 minutes $6.67 $200 $2,400
75 MPH 40 minutes $7.50 $225 $2,700
cost savings traveling the legal speed limit of 55 mph compared to 20 mph over, $900 annually.
city driving - accelerating quickly wastes gas.  Braking hard wears out your brakes and tires and 
then you have to spend money to replace them sooner then if you drove less aggressively.
http://www.seabreezecomputers.com/savegas/