howdy all, thought i'd contribute my experience since October last year.
so in Victoria, BC the city speed limit is 40km/hr; i happen to think it's the best city on gas. It's small, walkable, fun, safe and no winter!
if driving, i try to get up off the line while tranny's in 1H, getting momentum up quick, and then keep below 2000RPM climbing thru the gears.
- i'll also take overdrive off or use PWR button to climb hills in shorter time than bog down gulping gas in od at a snale's pace.
265/75/16 uniroyals laredo's. 293k.
FYI: around sea level not exceeding 65MPH
i'm getting 15MPG.

i've been adding in the Lucas injector/ MPG fuel additive, and just added some of the below (aka Murray's) to top up the oil 1000 km before my 1st oil change...
- i'm encouraging a new trend for 2015: Gal/year - who's having most fun on least fuel!?
damian.
ps. the stuff above is impressive and i've heard a few great reviews around town.
just googled this:
XM-5 OIL STABILIZER is a 100% petroleum lubricant: it is purely oil itself and contains no metal, graphite, wax or detergent additives.
- FWIW, the inventor, Murray i heard, would drive to tractor shows, empty his oil, and let naysayers idle around in his truck all day/ worked fine.
- now invent that additive for gas/ drain it = still runs !
