Most Efficient .5 Ton While Towing

1320Fastback wrote:
Leaving on a three week cross country trip tomorrow and plan to fill tank to the second automatic shut off every time and hand calculate using GPS milage. Will not post results but should be pretty accurate.

Why wouldn't you simply fill the BIG open hole to the top???

"Will not post results but should be pretty accurate."

WHAT does the above mean???

GPS part is a good idea or simply determine if your odo is off and adjust mileage accordingly. I always added 5% to the mileage on my 98. My 15 is right on the money.