One little detail that always bothers me about the second movie, is how exactly Doc is performing all those complex flying maneuvers (swooping up and down, on the side, doing barrel rolls) when all he really appears to be doing is turning the freakin steering wheel the whole time. lol
There may be some pedal action to effects how the car maneuvers or the steering wheel is "pressure sensitive" so how much "push" or "pull" he puts on the wheel effects the car's maneuvers. (Similar to pulling back or forward on the yoke of a plane only the DeLorean's case the "yoke" (the steering wheel) doesn't move doesn't move and just gets a "driver intent" from how Doc pushes/pulls on the wheel.)
I kind of wonder what the hover-conversion guys thought when Doc pulled into the shop with the DeLorean to get the conversion?
Also, some note has been made in the past about the "Gas Prices" at the Texaco station in 2015 Hill Valley (hovering around $5 a gallon, IIRC) and remarking how the Gas prices where "high."
Considering Marty's Pepsi in the Cafe '80s was expected to cost $50 ($45 with a "cash use surcharge" in the book, IIRC, actually leaving him with $5 to) buy the book) and "thumbing $50" was considered a simple donation.
So from all of this we can look at it like this:
Doc gave Marty $50 for the Pepsi. (Which Marty never paid for, BTW)
Today a Pepsi in a cafe-style restaurant in the 90s likely would've cost someone around $1 or $1.50. So there's a 33x increase in the cost of Pepsi over the course of 30 years.
In 1985 Marty's 25-cent "donation" is considered worthy of praise (and judging by the jiggling of the coins in the can probably an average donation, too.) Since $50 was consider a shrug-off worthy donation by 2015-Terry this suggests a 200x increase of prices!
Biff's cab-ride from Hill Valley to Hilldale is around $176. The cost of either almost four Pepsies or almost four pithy donations.
The gas in the Texaco in Hill Valley in 1985 is, IIRC, around 80-cents a gallon. In 2015 it's around $5 a gallon a little over a 6x increase. So ten gallons of gas (about what it'd cost to fill an average car up) costs as much as a Pepsi, as much as a forgettable donation or a 1/4 as much as a cab ride between two local communities. (Downtown to a nearby suburb.)
So, really, it seems like gas in 2015 (or whatever fuel they're using) is
really damn cheap. That or Pepsi is really expensive and a lot more is expected out of you as far as donations.