[SentraSE-R]

We took a trip this week from Montgomery, AL to Biloxi, MS. She got her mileage reimbursed, so she filled the tank before departing, and at arrival in Biloxi. Vehicle is a 2005 Grand Caravan with 3.3 L V-6 and AT.

She drove 80 mph going down. 262 miles on 12.2 gal = 21.5 MPG . It's a 240 mile drive, so ~3 hours to get there.

We took the trip because she had to have surgery. I drove back at 62 mph. ~4 hours to return. We stopped for dinner en route, and she dozed much of the way, so the slower trip didn't matter to her, and she was my captive audience anyway. My mileage? 240 miles on 9.2 gal = 26.1 MPG . That's a 21.3% improvement just from slowing down. I didn't try high speed P&G, just slowing down.

At $2.46/gal, her half of the trip cost $30.01 v. my $22.63. She spent an extra $7.38, or 33%, in fuel costs for her haste. I also pointed out the high speed conga line of cars <1 second following distance from the one in front of each of them.

I doubt it will help, but the indisputable facts are there for her comparison. She has the gas receipts to turn in.