@speedy:
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Fuer mich klingt "leadfoot" geradezu grauenhaft nach Germanismus, ich lasse mich aber gerne von native speakern korrigieren.

Blei|fuß, der: meist in der Wendung mit B. fahren (ugs.; ständig mit Vollgas fahren).
[DUDEN]

lead·foot, n. Informal.
a person who drives a motor vehicle too fast, esp. habitually.

Found in: Random House Webster's Unabridged

Is this a common expression or just a dictionary word? I couldn't find it in any other online reference.

@Doris: i've just called an Australian friend of mine, since i'm unaware of the usage in BE of lead-foot, and would have considered it a Germanism myseld, and he confirms it as being in normal usage in AusE -

so it appears to be in (regional?) usage

perhaps other native speakers (CanE, AE, BE, and so on) could give some feedback here?

Google

"A lead foot can lead to a lighter wallet: 90 Percent of Drivers Surveyed Admit to Speeding; Tickets Can Increase Auto Insurance Rates By As Much As 25 Percent Or More. MAYFIELD VILLAGE, Ohio — March 1, 2004"
http://www.progressive.com/newsroom/Lead_Foot...

"Speeding ticket advice: ... You’re caught and you didn’t even know you were speeding. ... 4. Use your cruise control to lock you into the speed limit and keep that lead foot in check. ..."
nh.essortment.com/speedingticket_rfzv.htm

"Lead-foot drivers to help fill coffers. ... Massachusetts drivers caught speeding will notice an additional $25 surcharge on all tickets starting this month" www.eagletribune.com/news/stories/20030731/FP_001.htm

"Leadfoot drivers back speed cameras" www.theage.com.au/articles/ 2003/04/22/1050777256440.html

"Bob had always toldher that her leadfoot was going to get her into trouble ... She smiled up at him and readily admitted to himthat she knew she was speeding." www.dimensionsmagazine.com/dimtext/stories/speeding.html

Plenty of examples of "lead foot", "lead-foot" and "leadfoot" -- above just a few

The Macquarie Dictionary. © 2003 Macquarie University, 2003 Macquarie Library Pty Ltd (online edition).
leadfoot
// (say 'ledfoot) noun Colloquial a driver who is given to heavy use of the accelerator pedal and to high-speed driving. [LEAD2 + FOOT]

Webster's New Millennium™ Dictionary of English, © 2003 Lexico Publishing Group, LLC
Main Entry: lead foot
Definition: tendency to drive too fast; this habit or practice

Lighter, Historical Dictionary of American Slang:
leadfoot n. 1. a motor vehicle driver who habitually drives fast. Hence lead-footed, adj. given to speeding. Hence leadfoot, v., to drive fast.
1938 in AS (Apr. 1942) 104: Lead Foot stepping on the gas
[..]
1991 DayWatch (CNN-TV) (Dec. 20): Efforts to crack down on lead-footed police.

The Canadian Oxford Dictionary
lead foot n. N Americ. informal the prectice of driving too quickly, esp. habitually (drives with a lead foot).
lead-footed adj. N Americ.
1. slow or sluggish (a lead-footed skater).
2. tending to drive too quickly (a lead-footed driver).

Das Wort ist zumindenstens fuer US, Australien, und Canada belegt. Ich habe keine Wörterbuchbelege für UK, Neuseeland, Südafrika, oder Indien gefunden.

Oxford Duden

leadfoot (n.) is definitely used in AE.
Related: [put the] pedal to the metal (step on the gas, all the way down)

Mit „Fuß vom Gas“ kein „Blei-Fuß“ mehr

Taking your “foot off the accelerator” to stop putting the “pedal to the metal”

Taking your “foot off the accelerator” to avoid being a “leadfoot”

Taking your “foot off the accelerator” to “go easy on the gas”

I'm certainly not familiar with "leadfoot", although I remember "put your pedal to the metal" occurring in some lyrics of a song that I believe was American. How would you guys deal with the above?

Not that it is terribly relevant, but this was the song I was thinking of...

Although these lyrics look more familiar. I'm not sure that other page was right.

Lead foot/leadfoot is common in AE, too.

Not totally on topic, but some might enjoy this.
http://www.unwind.com/jokes-funnies/miscjokes...
SIGNS YOU HAVE A LEAD FOOT

You're the first person to be put on the FBI's most wanted list just for speeding.

Your friends car pool with you not to save gas but to save time.

You need three states just to go on a joy ride.

You have a suspended drivers license in all 50 states.

When you stop you leave a mile long skid mark.

You married your wife because she had a corvette.

Your bumper sticker says, "My other car is even faster."

You get blisters from your gas pedal.

Your car won't start unless it has 110 octane gas in it.

You get pulled over even when your not speeding just to get a warning not to speed.

You always leave at the last minute but you're never late.

Your friends leave a hour before you do just so you can meet them at the same time.

You don't wear a seatbelt, you wear a crash helmet.

Your speed gauge is stuck in the max speed position.

You can go through three drive thrus at the same time.

There's a radar detector named after you.