I calculate my mpg between fill ups and always average 21. i drive fast, even WOT at times. 100% rural driving (guys, whats the word here...obv not city because its ol Pennsylvania country roads) but yeah you get it.
Went on a road trip about two weeks ago. Car has synthetic oil, and fresh Amsoil in the tranny. I also put a double dose of injector cleaner in the tank. Tires are stock 17inch pumped to 34psi.
I got 710Km on 61 litres of gas. That works out to 29mpg. I was averaging about 75mph with a few hits around 80-85 and some city driving also. This is the best mileage I ever got. Usually I get around 25mpg
My GS400 has averaged just slightly over 20mpg over the course of the last 4 years and 28,000 miles (140k total mileage). I get in the mid to high 20's on highway trips but I do more city driving than highway, the car has no mods and I check the tire pressure frequently.
My average is 21MPG all around (70/30 city/highway mix)
Personal best over 445 mile trip prior to this week was 28.6MPG (75-80MPH with AC on) I just repeated the same trip but filled up after the first 301 Miles and got 26.48MPG (Cold weather 28-32 degrees) on the second 144 miles I average 37.27MPG. I believe the cruse control set to 65MPH for most of the 144 mile stretch made a big difference (65MPH was not by choice it was a Seasonal Speed Limit Strictly enforced through a section of I-80 in Wyoming) this bring my personal best to 29.21MPG over 445 miles.
Not bad for a 11 year old card with 123K...
1987 Pearl Black 190e 2.3-16V
1999 Alpine Silver GS400
2006 Onyx Black QX56
Checked recently. 14 mpg city. I've changed the O2 sensors since then. The CEL and the fuel smell in the exhaust is gone. Anxious to find out if the mpg has improved.
White '99 GS400, Millen strut bar, clear side markers, Silverstar bulbs, Polarg and LED anywhere they'll fit, yellow fogs, Goodyear 16in F1's, Goodyear Gatorback accessory belt, '04 taillights and no stinkin badges.