Anything could be wrong with it, but it was a year or 2 from brand new and only had 15,000 miles on it, so I hope there wasn't much wrong with it! He was on the throttle hard, but then set the cruise, so it is what it is....
Hard throttle would do it. Well, maybe not 4 mpg but 6-7.
Not for mileage, but I drive like the there is a n egg on the gas pedal.
I am literally an "Old man in a Lincoln" most of the time. Well, not really old yet, unless you ask someone under 30.
I impede traffic and piss some people off I'm sure.
Don't get me wrong, I will drive 100+ on about any road- if I have a reason too, but let's not get into my play car driving- but for 90%+ of my time behind the wheel, I am in no hurry.
I had a 98 Town Car I drove for years that got 18.4-19.2 around town with AC on. That's how easy I drive.
Most of these get no more than 16.5-17.5 around town.
Eggshell I tell you. I never use cruise. I can get better mileage than it can.
Oh, and I air my tires to 80 PSI. Just kidding! Not those tires, but my load E's get 72-80.
You can make a BIG difference by a light pedal taking off, then let it get as fast as it wants down hills. Let it slow down uphill as long as you are not going ridiculously slow.
Yep, if you follow me for 10 miles, you might see me doing 52 in a 70 and 85 in a 70. Most people set cruise or at least keep it about constant whether it's 65 or 73 etc.
I go with the flow, so to speak. I used to have a MCI diesel pusher bus with 8v-71 and 4sp spicer trans. They never see 10mpg. 7.5 maybe 8 on a good day.
I routinely held clutch in or shifted to neutral down after getting up past desired speed or down hills. There are some old school (because manuals are old school now) rules about not doing either but not really a big deal unless you are one of those marked grades.
It didn't net me any real noticeable increase in mileage because as I said, they never hit 10. I think you can pin it to floor most all the time (which is how most people drive a detroit diesel--it is in the manual IIRC) and still get 6.8...turn off the engine and get towed and get 7.8 so what's the difference!!!