OK, I've been wondering what kind of mileage I've been getting. I haven't been driving very far, mostly in a 20 mile radius and the main speed limit up and down the valley I live in is 35. Been on the freeway for short distances a couple of times, forgot to look at what my max speed was.
I ran almost a tankful over the last couple of weeks whilst making sure my gps was on. I think(fingers crossed) that I got all the mileage, if not I'm only a mile or 2 off.
So on Friday I filled up the tank and checked the gps against the speedo odometer. The gps showed 250.1 miles and the odo 201.6. a 50 mile difference although the speedo indicates in a wonky way, somewhat close to the actual speed.
The numbers show that I used 8.98 gallons(US) which was approximately 7/8 empty on the gauge. Covering 250.1 miles gives me 27.84 miles per gallon.
That's good and now I know that I still have 3 gallons in the tank.