Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: rbowman Newsgroups: comp.os.linux.advocacy,comp.os.linux.misc Subject: Re: OT - TV Date: 9 Oct 2026 02:28:32 GMT Lines: 29 Message-ID: References: <118cshs$2v7m0$1@dont-email.me> <11987r4$dcgn$1@dont-email.me> <11991m3$mv9t$1@dont-email.me> <119as35$18kn0$1@dont-email.me> <119bbo8$1e3hu$1@dont-email.me> <119is9d$68cr$1@dont-email.me> <119j2qg$8pgq$1@dont-email.me> <119m338.o7c.1@ID-201911.user.individual.net> <119qnr6$2urls$1@dont-email.me> <119qr92$2vglb$2@dont-email.me> <119r8k4$3515t$1@dont-email.me> <119tba1$3quvc$1@dont-email.me> <11a38uf$24fks$1@dont-email.me> <11a4u79$2lnse$1@dont-email.me> <11a55g7$2nipf$4@dont-email.me> <11a5at8$2nipf$18@dont-email.me> <11a80sh$3pnm3$4@dont-email.me> <11a90dj$7ae1$1@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net XpHUXhfJgJ8ZBrZfpCzjjAWkayAHi8qeHI6XY2hcgA84NX2NuI Cancel-Lock: sha1:aMIhmr4tP/0maKQ7o9I3vCH+pHc= sha256:fcb/PxssJp6U1SLW32oU+5Fsqg4lHwqPdDmgYVC8YKM= User-Agent: Pan/0.165 (Kostiantynivka) Xref: csiph.com comp.os.linux.advocacy:723497 comp.os.linux.misc:93220 On Thu, 8 Oct 2026 22:02:41 +0100, J. P. Gilliver wrote: > If your journey involves about the same amount of uphill and downhill, > and you're _not_ using the brakes, where is the downhill energy going? > Either engine braking (which is another form of "using the brakes", but > even worse in that it might actually use fuel), or you're accelerating > on the downhill parts and using the speed thus gained to help you on the > uphill - > makes you a bit dangerous in the valleys. The trucks I drove mostly had Jake brakes but a couple had simple exhaust brakes. You were off the throttle so little or no fuel was being injected but you were not reclaiming any energy. https://en.wikipedia.org/wiki/Jacobs_Vehicle_Systems Many of the eastern trucks weren't equipped and like Clessie Cummins came off Cajon rather rapidly with smoking brakes. That's what the runaway ramps are for. I did haul a load to West Virginia. The exhaust retarder wasn't working and the shop was waiting on parts. The shop foreman said 'No problems. You're going east and we'll fix it when you get back.' He apparently had never been to WV. They might not be 7 mile grades but they make up for the lack of length with the grade.