[Big Dave]

I do my testing using my fairly long (50 miles one-way) balanced (one-third urban, one-third rural roads, one-third Interstate) circuit for real-world MPG testing.

Since I don't have precision fuel metering equipment, I use long tests and all the inaccuracies average out.

As A result I think a valid MPG testinvolves about 1500 miles. Four fill-ups.

ScanGuage is OK for short-term comparative tests, but snapshots are NOT real world MPG