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| Re: [GMCnet] Keeping it Real, 8 to 10 mpg [message #172508 is a reply to message #172490] |
Thu, 07 June 2012 20:25   |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| Dave Skowron wrote on Thu, 07 June 2012 17:00 |
I WISH I got 8 to 10 mpg. My only trip (250 miles largely up hill) in
the '76 Eleganza (with headers) was at 5 mpg. Not towing a TOAD. Just me
and a 12 oz. bottle of spring water and a Springfield 1911A1.
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Others will give you a list of things to check with the engine other drive train stuff.
I would like to add the running gear. Brakes, bearings and tires. Check them for heat and abnormal wear. If it is scrubbing the tires it is taking more power to roll down the road. If the brakes are dragging (and heating up) you are using more gas.
Have you been using the generator much... if can effect the fuel in the tank by a surprising amount.
But keep in mind you are using a VERY small sample. It might be just an issue of not getting the tanks burped on the first fill-up (leaving less fuel in the tank) and getting a good burp (and more fuel into the tank) on the second fill.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Keeping it Real, 8 to 10 mpg [message #172511 is a reply to message #172508] |
Thu, 07 June 2012 20:48 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| Mike Miller wrote on Thu, 07 June 2012 20:25 |
But keep in mind you are using a VERY small sample. It might be just an issue of not getting the tanks burped on the first fill-up (leaving less fuel in the tank) and getting a good burp (and more fuel into the tank) on the second fill.
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I don't feel a MPG calculation is of any value unless it is calculated over at least 5 fills. A single fill MPG calculation is, IMO, generally useless. I have kept a spread sheet, for each vehicle, of my mileage and gas usage for many years. The fill to fill MPG can vary quite a bit even though the vehicle use is identical over the fill usage (commuting, same miles, traffic and weather). The 5 fill MPG calcs are very consistent and match well with the MPG since the very first fill. It will be interesting to see how this works with the GMC when (if?) I ever get it on the road.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Keeping it Real, 8 to 10 mpg [message #172521 is a reply to message #172511] |
Thu, 07 June 2012 22:38 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Story time!!!
On out first trip out, my wife took up driving at the bottom of Lake Michigan and I was navigating. We went north, up through the Chicago suburbs at rush hour and she just drove with the traffic. All I could think of was when she had my Opal GT running 98~100 on the New York Thruway (we didn't get caught). I kept saying "Mary, do you know how fast you are going?" I did, I had the GPS in the laptop in front of me. That is how I KNOW that the coach is very comfortable at 85+....
When we fueled, it worked out to 7.5 on that tank...
In all fairness, when I explained the situation, she got the plan. We didn't have that issue again. In fact, on out way back across the UP (Michigan again), she relaxed and ran low and we turned in a 10.6 and 12.1. We can still run up there (with a 9460# 23') if we are careful and taking out time.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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