[Big Dave]

I did the harpoon mod way back. Filling took forever before that.

But let's face it. Unless you've spent big bucks for a graduated fill column getting consistent fill-ups is an iffy thing regardless.

I defeat that by extension. I make my tests over 1,600 miles on a repeating circuit - third Interstate, a third two-lane state roads and a third urban/suburban. Drive the posted limit (70 for the slab, 55 or 60 for state roads and along with traffic in town) That four fill ups.

After four fill-ups the variations have averaged out and I get believable results.

When you seek MPG, instant gratification is elusive.