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Back when I was testing a 2000 Mercury Grans Marques and tiring MPG Improvement devices I found the following:
At 65MPH and at 1750 RPMs this car was able to get 27 to 30MPG.
This was a stock 2000 200HP 4.6 Non- IP intake running stock wheels and tires and a 3.27 Rear end.
I was able to get 35MPG at 65MPH and at 1750RPMs by Leaning it out to its best reading at 16.4 A/F ratios.
Later on a road trip to Riverside CA from Phoenix AZ I drove at 85MPG to the CA border (just short of Blythe CA) where I filled up. Apox 145Miles and I was getting 24 MPG. Once in CA with its speed limit of 70 MPH rather than the AZ limit of 75MPH I drove slower and ran 75/80 from Blythe to Riverside which is about 163 miles when I again filled up and recorded 25/26 MPG.
Last year I made a to Lake Havasu to buy a pair of transmissions in my 02 Vic P71/Mercury clone. She drove and rode great and her passing power on the old two lane rood was great.
MPG were not bad was running 80/85 on I 10, then 65/75 on the old two lane highway. Got gas at Quartzite to check and read around 21/22MPG then refilled at Quartzite on return and read 22/23.
This was a stock 03 P71 250HP IP intake 4.6 running stock wheels and tires and a 3.27 Rear end.
Even with a 4L80e and a US Gear overdrive in the trunk. I could hardly feel the extra weight.
These two transmissions are for my 93 G20 Van. I am making the Van into a 5 speed double overdrive system.
It is my theory that with a V8s like the 4.6 and a 383 I can drop the RPMs down to 1600 to 1800RPMs and get very good MPG.
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