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Just pushed the bar a little higher without running out of gas, sorry Jus. Smart Gauge reads 902.2mi/14.13gal and 63.8mpg then corrected for(New Tires) Odometer error of 1.019%= 918mi.. I put in 13.5gal., second click= 68mpg for the trip. In theory having .4-.5gal. left I could have gone another 25-30mi. before running out or 945-950mi. total. Also 72% EV, 28% ICE. My Wife and I decided go someplace Warm after Xmas, Florida didn't disappoint with temps in the 70's-low 80's to look at Lighthouses for fun. It turned out to be harder than I figured but that's another story. To get ready for the trip I set up MADMAX with everything I could think of to improve MPG's like 50PSI tire pressure, installed New Upper Grill Cover along with Center and lower Grill Covers. Also Wheel Covers, GasPods, covered Fog Lights and taped seems around hood, Lights and Grill Covers with clear packing tape to minimize heat lose. You get your best MPG's when WT is above 200*F which I monitor with my ScanGaugeII. I topped off my tank with eight gallons ethanol free gas plus 2gallon gas can if I needed it, I didn't. Started trip Dec. 26th and it took 4 days to go the 900+ miles. The first day temps in Newnan,GA were 35*F when we left and it took about a hour to get the WT up 200*F with speeds between 35-55mph on State Routes and about three hours before I could get my average to 60mpg when temps got up to the 50's. After 10 hours I was up to 67.4mpg so things I thought were looking promising. Second day I lost .5mpg right of the bat because of warm up of ICE, couldn't plugin ICE heaters on the trip. Then made a wrong turn and ended up on I-95 for 15mi. with speeds up to 77mph, lost another .5mpg. St. Augustine was having a Party and got stuck in gridlock for 2.5 hours and only lost another .5mpg. Third day started at 66mpg and by the end of the day I was down to 65mpg average, because of head winds. Forth day we had rain so we lost another 1MPG so I thought from looking at the not so Smart Gauge being off by .6 gallons and I went at least 50 miles pass 0m to E expecting to run out at any time for the last 30miles. It looks like I could have gone another 20-30miles. I still think it is possible to go a thousand miles on at tank, but everything would have to go your way to do it. It looks like if traffic and weather conditions had cooperated I could gotten around 970-980miles, getting very close. :yahoo: Paul

Here is an explanation of what it took to get 875.3 actual miles as verified by Garmin GPS. Smart Gauge is off by 1.4% which comes out to about a .5mpg improvement. From what I have heard from other C-Max owners, this appears to be a common problem. BTW I didn't run out of gas and might have made 900mi with the remaining gas in the tank! First: Fortunately a business trip to Deltona, FL gave me the golden opportunity to plan the ultimate fuel economy test trip!Second: My goal was 900 mi. on a tank.Third: I calculated 45mph as the average speed needed to accomplish 900 mi.Fourth: Realistically, you can't drive on Interstates because it's not safe to travel between 40-45mph. In planning my route I used MapQuest and GoogleMaps trip planning to avoid Interstate highways. By using State highways I was able to save 40 mi. each way and typically the speed limit is 55mph. With less traffic I was able to drive 40-55mph.Fifth: P&G (Pulse & Glide) is the strategy for max mpg, no ECO Cruise. You need to watch your Miles To Empty (MTE) to make sure you are going to make it. I started with Pulse to55-60mph and Glide to 45mph. Halfway through the trip I could see it was going to be close so I slowed down to 40mph and easily made it. Here is a list of MODs and explanation: Grill Covers minimize heat loss from ICE and improve aerodynamics to improve MPGs. Top off with Non Ethanol gas improves MPGs 1+ but is not cost effective for regular use, $4/gal vs $3.19/gal. GasPods improve aerodynamics, not sure how much yet. 45psi in tires. Covered Fog Lamps with clear carpet tape. ScanGauge keeps track of Coolant Temps, Instant MPG, Air Intake Temps and RPMs. Garmin GPS keeps track of actual miles traveled, average speed and route. It is advantageous to compare the routes between two GPSs; many times they do not use the same route! I also recommend MapQuest or GoogleMaps to plan the trip, print out directions and compare to GPS routing. Drafting is problematic on back roads because it is hard to find a suitable drafting partner. Truckers tend to drive 65mph in 55mph speed zones and that is just too fast and stressful to achieve optimum MPGs. Weather is important for good MPGs and I was lucky with winds light and variable and 63-84 degree temps so didn't use the AC. I had an EV of 66% and high 90%s for brake scores. Here is my Lifetime Score as of October 2, 2013 and it keeps going up!